Bazzania undetermined

Thouvenot, Louis, 2024, A revision of the genus Bazzania Gray (Lepidoziaceae, Marchantiophyta) in New Caledonia with a review of the type specimens, Cryptogamie, Bryologie 20 (6), pp. 117-154 : 121-122

KEY TO THE BaZZania GRAY SPECIES IN NEW CALEDONIA

1. Leaf and underleaf apices deeply dissected into similar long lanceolate lobes; large plant with shoots up to 6 mm wide when flattened and leaves 1.80-3.75 mm long ................... B. deplanchei (Gottsche ex Steph.) Jovet-Ast

— Leaves entire, dentate, or with the most developed lobes triangular to finger-like; underleaves various; plants medium to small with shoots up to 3 mm wide when flattened and leaves less than 2 mm long, if larger, leaves entire ........................................................................................................................................................... 2

2. Leaves caducous, fragile, with sub-entire apices, generating endogenous propagules made of daughter cells born inside the leaf cells and released when leaves are broken ......................... B. kokawana N.Kitag. & T.Kodama

— Leaves not caducous, apices various, not producing endogenous propagules ................................................ 3

3. Leaves widely ovate-triangular, shortly bifid, deflexed when moist as well as dry; underleaves entire, rounded to reniform ................................................................................................................. B. wooroonooran Meagher

— Leaves ovate to oblong or lingulate, apices entire, dentate, or more often 3-lobate, usually deflexed only when dry; underleaves various .............................................................................................................................. 4

4. Hyaline cells occupying all or part of the underleaf surface, at least forming an apical marginal band, then thinner-walled than the basal cells ............................................................................................................... 5

— Hyaline cells lacking, underleaf surface only made of chlorophyllous cells; if marginal cells are discoloured, they are few and otherwise like the underlying chlorophyllous cells .................................................................. 13

5. Hyaline cells filling the whole underleaf surface or nearly so, with a few chlorophyllous cells at base ........... 6

— Hyaline cells forming a narrow or wide marginal band ................................................................................ 7

6. Leaves glaucous green, opaque due to their strongly warty surfaces; apices entire; vitta obvi ........................... ............................................................................................................................ B. vittata (Gottsche) Trevis.

— Leaves not glaucous, translucent, surfaces smooth except the marginal cells; apices 3-dentate; vitta lacking .... ...................................................................................................... B. tridens (Reinw., Blume & Nees) Trevis.

7. Underleaves with a narrow hyaline margin, usually 1-2(-4) cells wide .......................................................... 8

— Underleaves with wider hyaline margin, at least 3 cells wide ...................................................................... 10

8. Leaf apices truncate, 3-lobate; lobes tooth-like to shortly triangular, up to 3 cells long ................................... ...................................................................................................................... B. paucidens (Steph.) H.A.Mill.

— Leaf apices narrowly truncate to rounded, typically unlobed but some leaves with 1-3 one-celled teeth or emarginate .................................................................................................................................................. 9

9. Leaves widely ovate, nearly as wide as long; margins sharply and densely denticulate to serrate by mamillated cell protrusions; median cells with firm walls and large trigones, often confluent; areolation nearly homogeneous without subvitta; only a few hyaline cells along the underleaf margins ..................................................... ...................................................................................................... B. loricata (Reinw., Blume & Nees) Trevis.

— Leaves from ovate to oblong, longer than wide; margins sub-entire or with denticulations produced by cell protrusions with evenly thickened walls; margins less arched; median cells with null or medium trigones; areolation homogeneous or not; underleaf hyaline margins narrow, continuous when fully developed and not eroded ... ........................................................................................................... B. bernieri (Steph.) Inoue & H.A.Mill.

10. Lateral leaf margins denticulate; underleaf apices dentate-denticulate ............................................................. ............................................................................................................ B. adnexa (Lehm. & Lindenb.) Trevis.

— Lateral leaf margins entire, or little crenulate-denticulate in upper part; underleaf apices repand to lobulate 11

11. Plants small, shoots 0.8-1.5 mm wide; underleaves wider than long, with hyaline cells firm walled, slightly different from the chlorophyllose cells; margins lobulate-dentate; central and basal leaf cells conspicuously larger than the median cells, forming a clear subvitta .............................................. B. consociata (Steph.) H.A.Mill.

— Plants larger, shoots 2.0- 3.5 mm wide; underleaves as wide as long or slightly wider, with hyaline cells thin-walled; margins roundly lobulate to sub-entire; leaf cells more homogeneous, subvitta hardly defined ....... 12

12. Leaves ovate-oblong to oblong, length-wide ratio over 1.5; apices conspicuously 3-lobate, lobes triangular; median cells with small acute trigones; underleaf hyaline margins width variable ........................................... ....................................................................................................................... B. franciana (Steph.) N.Kitag.

— Leaves shortly ovate, length-ratio up to 1.5; apices 3-lobate; lobes less obvious, tooth-like to triangular; median cells with large bulging trigones, sub-confluent; underleaf hyaline margins narrow ......................................... ...................................................................................................................... B. paucidens (Steph.) H.A.Mill.

13. Underleaf lobes elongated, triangular, lanceolate or finger-like .................................................................. 14

— Underleaf entire or with shorter lobes, usually tooth-like ................................................................................................ 16

14. Underleaf margins deeply incised all around, lobes acute; basal margins appendiculate, free of the leaves, appendiculae acuminate-filiform; leaf cells warty; subvitta inconspicuous ................................................................ .................................................................................................... B. caudistipula (Steph.) Inoue & H.A.Mill.

— Underleaf margins deeply incised only at the apices, lobes elongate, acute or finger-like; basal margins nonappendiculate, unevenly connate to the leaves; leaf cells smooth; subvitta conspicuous or ill-defined ......... 15

15. Underleaf insertions close to the leaf bases on both sides of the stem, strongly recurved, nearly squarrose, underleaf apices divided in 3(-4) lobes, lobes widely triangular to lanceolate, the median lobe often shorter or lacking; leaves narrowly oblong to ligulate, leaf lobes triangular to lanceolate-acute ...... B. incrassata (Steph.) N.Kitag.

— Underleaf insertions close to the leaf bases on a single side of the stem, loosely recurved, patent, underleaf apices divided in more than 3 finger-like lobes; leaves oblong, leaf lobes triangular ..... B. subtilis (Sande Lac.) Trevis.

16. Underleaves obviously wider than long ...................................................................................................... 17

— Underleaves nearly quadrate to longer than wide ....................................................................................... 20

17. Leaf apices with long, narrowly triangular lobes, separated by a wide lunate sinus; underleaves apices truncate, entire to variously lobate, lobes wide and apiculate ............................................... B. parisii (Steph.) N.Kitag.

— Leaf apices with short lobes; underleaf apices entire, denticulate, repand or round-lobed .......................... 18

18. Leaves widely ovate, nearly as wide as long, both margins similarly arched; leaf apices unlobed, at most few dentate and denticulate; median cells with firm walls and large trigones, often confluent; areolation nearly homogeneous without forming a subvitta; plants large, shoots 4-5 mm wide ................................................. .................................................................................................... B. loricata (Reinw., Blume & Nees) Trevis.

— Leave ovate-oblong to ovate-ligulate, markedly longer than wide; asymmetrical with ventral margins nearly straight to concave; leaf apices usually 3-lobed; median cells with or without trigones; areolation homogeneous or not; plants smaller, shoots up to 2.5 mm wide ...................................................................................... 19

19. Shoots less than 2 mm wide when moist; leaf cells with a sharp transition between the median cells with evenly thickened walls, trigones lacking or inconspicuous, and the larger central and basal cells with large acute trigones, forming a clear subvitta; leaf apices denticulate, truncate, shortly 3-dentate; underleaf apices lobulate-dentate, often with a marginal band of hyaline cells with firm walls ............................ B. consociata (Steph.) H.A.Mill.

— Shoots more than 2 mm wide when moist; leaf cells progressively increasing in size from apices and margins towards the bases, forming a poor subvitta; cells firm walled with more or less conspicuous rounded trigones; leaf apices smooth to remotely denticulate, truncate to obtuse (rarely rounded), variously 3-lobate, lobes shortly triangular or tooth-like; underleaves at most with a few hyaline cells on margins; underleaf apices repand to shallowly lobulate ........................................................................................................... B. bescherellei Steph.

20. Leaves complanate when dry, spreading at right angle when moist, shortly imbricate only at bases; median cells thick-walled, small triangular trigones barely visible; subvitta conspicuous; underleaves with repand margins, as wide as the stem ..................................................................... B. pectinata (Lindenb. & Gottsche) Schiffn.

— Leaves more or less deflexed when dry, variously set in moist condition, imbricate; median cells thin-walled with conspicuous trigones; leaves with at most a small basal subvitta; underleaves various ................................. 21

21. Leaves deflexed in moist condition; long ligulate, length to width ratio 2.8 on average, nearly symmetrical; median cells with very large trigones, as large as the cell lumina, often confluent; underleaves small, 1.0-1.5 times the stem width .......................................................................................... B. quadratistipula H.A.Mill.

— Leaves spreading in moist condition; ovate-oblong to widely lingulate, length to width ratio 1.6 on average; asymmetrical; median cells with rounded trigones, smaller than the cell lumina, not confluent; underleaves larger, 2-4 times the stem width ..................................................................................... B. bescherellei Steph.