Fissidens papillisetus Brugg., 2022

Bruggeman-Nannenga, Maria Alida, 2022, Five new species of Fissidens Hedw. (Fissidentaceae, Bryophyta), taxonomic notes and a new species record for South Africa, Cryptogamie, Bryologie 20 (3), pp. 37-49 : 40

Fissidens papillisetus Brugg. -Nann., sp. nov.

( Fig. 3 )

Cryptogamie, Bryologie 43 (2): 23 nomen nudum.

HOLOTYPE. — Mauritius. Mt. Le Pouce , 20°13’05”S, 57°31’19”E, dwarf (0.5-2 m tall) elfin forest on sharp W ridge leading to the main peak, S face, ramicolous, alt. 770-780 m, 20.III.1995, Florins & Pócs 9538/ B (holo-, L; iso-, EGR).

ADDITIONAL SPECIMEN (PARATYPE). — Mauritius. Mt. Le Pouce, 20°13’15”S, 57°31’08”E, huge open basalt cliff at S face, ramicolous, alt. 560 m, 20.III.1995, Florins & Pócs 9538/ C (holo-, L; iso-, EGR). (This specimen has almost the same number as the holotype but comes from a different location.)

ETYMOLOGY. — This species has been named for its papillose setae.

ECOLOGY. — On bark of branches, growing in dense mats; once collected on an open basalt cliff, and once in an elfin forest.

DISTRIBUTION. — Mauritius, Le Pouce, alt. 560- 780 m.

Figures

FIG. 3. — Fissidens papillisetus, sp. nov. A, vegetative stem; B, sporophytic stem; C, leaves; D, leaves in polarized light to show the limbidia; E, leaf apex; F, mid leaf;G, basal part of leaf; H, detail of I, showing a single lamellar plate with distinct vertical ornamentation; I, basal part of peristome with close-packed, horizontal plates; J, papillose calyptra; J1, J papillose calyptra with detail of the basal part to show the papillae; K, capsule with operculum; L, cross-section of stem showing thick-walled inner cortical cells and the central strand (all from holotype). Scale bars: A, B, 1 mm; C, D, K, J1, 0.5 mm; E-G, 50 µm; H, I, L, 20 µm; J, 100 µm.