Fissidens taxifolius
Fissidens pallidinervis
fissidens moss, yew-leaf pocket moss
pale-nerve fissidens moss
mostly branched;
axillary hyaline nodules absent;
central strand present.
branched and unbranched;
axillary hyaline nodules absent;
central strand weak or absent.
as many as 15 pairs, often undulate, oblong to lanceolate, obtuse to broadly acute, cuspidate, to 2.7 mm × 0.6 mm;
dorsal lamina truncate-rounded proximally, ending at insertion, not decurrent;
vaginant laminae 2/3 the leaf length, ± equal, minor lamina ending on or near margin;
margin evenly serrulate, often crenulate-serrulate on dorsal and ventral laminae, elimbate;
costa ending in cuspidate apex, taxifolius-type;
laminal cells 1-stratose, distinct, smooth, bulging, firm-walled, irregularly hexagonal, 8–11 µm frequently paler at margin, conspicuously mammillose in vaginant laminae, larger and clearer juxtacostally.
as many as 18 pairs, lingulate to lanceolate, rounded to obtuse to broadly acute, to 1 × 0.25 mm;
dorsal lamina narrowed or rounded proximally, ending at insertion, not decurrent;
vaginant laminae ± 1/2–2/3 leaf length, ± unequal, minor lamina ending near margin;
margin serrulate, limbate, ± entire in proximal 1/3–1/2 of perichaetial and subtending 1–2 pairs of leaves, limbidium sometimes indistinct, limbidial cells 1-stratose;
costa ending 3–25 cells before apex, often spurred distally, bryoides-type;
laminal cells 1-stratose, pluripapillose, obscure, firm-walled, irregularly quadrate to hexagonal, 4–8 µm, in transverse section usually twice as deep as wide.
to 17 mm.
to 2 mm.
rhizautoicous;
perigonia on short branches proximal to elongate stems;
perichaetia on short, proximal, axillary branches.
rhizautoicous, cladautoicous, rarely gonioautoicous.
theca slightly inclined, slightly arcuate, bilaterally symmetric, to 1.5 mm;
peristome taxifolius-type;
operculum to 1 mm.
theca exserted, erect, radially symmetric, to 0.6 mm;
peristome scariosus-type;
operculum 0.3 mm.
cucullate, smooth, to 2 mm.
cucullate, ± prorate, 0.3 µm.
13–18 µm.
9–14µm.
1 per perichaetium.
1–2 per perichaetium.
Fissidens taxifolius
Fissidens pallidinervis
Fissidens taxifolius is distinguished by evenly serrulate or crenulate-serrulate leaf margin, stout costa ending in leaf cusp, conspicuous mammillose cells in the vaginant laminae, and sporophytes on short branches in the axils of proximal leaves. It can be confused with F. bushii, but that species is smaller, has costa shorter, and cells in the vaginant laminae have small, more or less inconspicuous papillae in the corners of the walls. Fissidens taxifolius usually occurs on shaded, damp soil or humus, whereas F. bushii is usually found on disturbed soil in woods, along paths, and in road cuts. Fissidens clebschii is considered to be a freakish expression of F. taxifolius (R. A. Pursell 2003).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Fissidens pallidinervis and F. elegans are the only species of the genus in North America with small, obscure, pluripapillose laminal cells. Fissidens pallidinervis, however, is distinguished by a rounded to broadly acute leaf apex, and a limbidium restricted to the lower parts of vaginant laminae of perichaetial and one or two pairs of subtending leaves. Axillary, stalked, multicellular, clavate gemmae have been reported in Japanese collections of F. pallidinervis.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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