Bryophytes (Mosses, Liverworts, and Hornworts) • Earth.com

Fissidens Moss

(Fissidens exilis)

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Description

Plants to 2.5 - 2 mm. Stem unbranched; axillary hyaline nodules absent; central strand absent. Leaves as many as 4 pairs, lanceolate to oblong-lanceolate, acute to obtuse-apiculate, to 2.1 - 0.4 mm; dorsal lamina ending before insertion; vaginant laminae 2/5 leaf length, unequal, minor lamina narrowed, ending on or near costa; margin of dorsal and ventral laminae - entire to crenate-serrulate, crenate-dentate on vaginant laminae, elimbate; costa percurrent to ending 2-3 cells before apex, bryoides-type; laminal cells distinct, smooth, plane, firm-walled, irregularly quadrate to irregularly hexagonal, 10-15 -m, marginal cells slightly smaller, vaginant laminal cells somewhat larger with 2-3 intralaminal rows irregularly elongate. Sexual condition rhizautoicous; perigonia gemmiform, proximal to perichaetial stems or scattered over protonemata. Sporophytes 1 per perichaetium. Seta 2-9 mm. Capsule theca exserted, erect, radially symmetric, infrequently slightly arcuate, bilaterally symmetric, to 0.7 mm; operculum 0.4-0.6 mm; peristome scariosus-type. Calyptra cucullate, smooth, 0.5 mm. Spores 11-14 -m.

Taxonomic tree:

Domain:
Kingdom: Plantae
Phylum: Bryophyta
Class: Bryopsida
Order:Fissidentales
Family:Fissidentaceae
Genus:Fissidens
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