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

Obtuseleaf Fissidens Moss

(Fissidens obtusifolius)

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Description

Plants to 8 - 1.5 mm. Stem branched; axillary hyaline nodules absent; central strand weak or absent. Leaves as many as 20 pairs, broadly ovate to oblong, rounded to obtuse, infrequently weakly apiculate in distal leaves, to 1.3 - 0.4 mm; dorsal lamina narrowed proximally, ending at or before insertion; vaginant laminae - 1/2-4/5 leaf length, - equal, minor lamina ending on or near margin; margin - entire, elimbate or weakly to strongly limbate, limbidium restricted to proximal parts of vaginant laminae of perichaetial, perigonial and subtending leaves, or present along entire length of vaginant laminae of most leaves, or variable on all laminae of larger leaves, often intralaminal in proximal parts of vaginant laminae, often spurred in vaginant laminae; costa ending 2-11 cells before apex, often spurred above, bryoides-type; laminal cells 1-stratose, distinct, smooth, - bulging, irregularly quadrate to hexagonal, 6-15 -m. Sexual condition cladautoicous, gonioautoicous, and possibly rhizautoicous; naked archegonia occasionally in axils of distal leaves. Sporophytes 1 per perichaetium. Seta to 3.5 mm. Capsule theca exserted, - erect, radially symmetric, to 0.8 mm; peristome bryoides-type; operculum to 0.3 mm. Calyptra cucullate, smooth, 0.5 mm. Spores 20-29 -m.

Taxonomic tree:

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