Colura corynophora (Nees, Lindenb. & Gottsche) Trevis.

Singh, Sushil Kumar, Pócs, Tamás, Singh, Devendra & Kumar, Shashi, 2020, A synopsis of Colura (Dumort.) Dumort. (Marchantiophyta: Lejeuneaceae) in India, Cryptogamie, Bryologie 20 (10), pp. 111-129 : 118

Colura corynophora (Nees, Lindenb. & Gottsche) Trevis.

( Figs 4 A-Z; 8E)

Memorie del Reale Istituto Lombardo di Scienze e Lettere, Serie 3,

Classe di Scienze Matematiche e Naturali 4: 402 (1877).

SPECIMENS EXAMINED. — India. Mizoram, Lunglei, Thorang WLS, 23°14’55.6”N, 92°33’48.3”E, 629 m, 30.XI.2011, S. K. Singh & Party 124232 (ASSAM); Lawngtlai, Ngengpui WLS, 22°29’49.7’’N, 92°46’33.1’’E, 138 m, 01.XII.2012, S. K. Singh & Party 127605A (ASSAM). HABITAT. — Foliicolous, growing in isolated population or in association with Caudalejeunea lehmanniana , Cololejeunea appressa , C. lanciloba , Leptolejeunea balansae , L. maculata , in relatively less moist places at elevation of 100-650 m a.s.l. DISTRIBUTION. — India [Mizoram-present study], Cambodia, China, Fiji, Indonesia, Malaysia, Mariana Is. New Guinea, New Caledonia, Philippines, Sri Lanka, Thailand, Vietnam ( Zhu & So 2001; Pócs 2013; Bakalin & Van Sinh 2016).

DESCRIPTION

Plants

Pale yellowish in herbarium; shoots 8-17 mm long, 1.2-1.8 mm wide including leaves, irregularly branched.

Stem

In cross section suborbicular in outline, 55-80 µm, 4 cells across diameter; cortical cells 7, subquadrangular, 17.5-35.0 × 12.5-25.0 µm; medullary cells 3, subquadrangular or sometimes slightly triangular, 12.5-22.5 × 7.5-12.5 µm; ventral merophyte 1 (-2) cells wide.

Rhizoids

Numerous, fasciculate at base of underleaf.

Leaves

Imbricate-contiguous, rarely remote, obliquely-widely spreading; lobes obovate, 0.66-1.02 mm long, 0.39-0.62 mm wide,

margin entire, dorsal margin slightly arched, ventral margin nearly straight; marginal leaf cells towards apex quadrate-subquadrate, 17.5-30.0 × 10.0-20.0 µm; median leaf cells hexagonal-polygonal, 25.0-40.0 × 15.0-25.0 µm; basal leaf cells hexagonal-polygonal, 22.5-37.5 × 10.0-25.0 µm; cells with cordate-nodulose trigones, intermediate thickenings frequent, 1-3 per cell wall; cuticle smooth; leaf lobules usually ³⁄₅-¾ as long as leaf lobe or sometimes equally long, wide at middle, in most cases reduced, tubular, slightly flaring toward sac, lateral margin usually slightly incurved, sac strongly inflated, occasionally reduced, always rounded at apex, entire at margin; valve elliptical-ligulate, 80.0-100.0 × 42.5-55.0 µm, composed of 12-18 median cells surrounded by a ring of 17-20 hyaline cells.

Underleaves

Distant, nearly transversely inserted to the stem, 0.20-0.24 mm long, 0.18-0.26 mm, deeply bilobed, sinus wide; 2-3 times as wide as stem, lobes linear-lanceolate, 7-8 cells long, 4 cells wide at base, margin entire.

Gemmae

Absent.

Monoicous

Androecia

Terminal on long or very short lateral branches; bracts in 3-5 pairs; bracteoles similar to underleaves but smaller.

Gynoecia

On long branches, terminal; bract lobe oblong, 0.28-0.34 mm long, 0.14-0.25 mm wide, rounded at apex, margin entire; bract lobule linear-oblong, ³⁄₅ as long as the bract lobe, truncate at apex, free margin plane, entire; bracteole similar to underleaf in the size and shape or sometimes highly reduced; perianth obovate, 0.6-0.8 mm long, 0.35-0.40 mm wide, with 3 wing-shaped keels, keels entire at margin, smooth on surface, beak very short, 1 cell long.

Seta

Orbicular in cross section, 62.5-150 µm in diameter with 4 inner and 11 outer cells.

Capsule

Globose, wall bistratose; cells of the outer layer 15.0-27.5 × 7.5-20.0 µm, with sinuate-nodular thickenings; those of the inner layer comparatively smaller, 10.0-22.5 × 7.5-20.0 µm, without or with minute sinuate thickenings.

Spores

25-65 × 10-20 µm, exine finely papillate with usually 1-2 elliptical to ovoid rosettes on its surface.

Elaters

160-210 µm long, 12.5-20.0 µm wide, walls slightly thickened.