Fissidens taxifolius |
Fissidens osmundioides |
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fissidens moss, yew-leaf pocket moss |
osmund fissidens moss |
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Habit | Plants to 11 × 3.5 mm. | Plants 2–21 × 2–3 mm. |
Stem | mostly branched; axillary hyaline nodules absent; central strand present. |
sparingly branched; axillary hyaline nodules absent; central strand present. |
Leaves | 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. |
in as many as 20 pairs, obovate to lanceolate, usually widest proximal to the middle, broadly acute to obtuse, often apiculate, 0.7– 2 × 0.3–0.7 mm; dorsal lamina rounded-truncate proximally, ending at or sometimes before insertion; vaginant laminae ± 1/2–3/4 the leaf length, ± equal, minor lamina ending on or near margin; margin crenulate throughout or evenly serrulate distally, elimbate; costa ending 2–14 cells before apex, taxifolius-type; lamina cells 1-stratose, distinct, smooth, bulging, firm-walled, ± hexagonal, 10–18 µm. |
Seta | to 17 mm. |
2–2.5 mm. |
Sexual condition | rhizautoicous; perigonia on short branches proximal to elongate stems; perichaetia on short, proximal, axillary branches. |
dioicous; perigonia and perichaetia on elongate stems. |
Capsule | theca slightly inclined, slightly arcuate, bilaterally symmetric, to 1.5 mm; peristome taxifolius-type; operculum to 1 mm. |
theca erect, bilaterally symmetric, to 1 mm; peristome taxifolius-type; operculum 1 mm. |
Calyptra | cucullate, smooth, to 2 mm. |
mitrate, smooth, 1.5 mm. |
Spores | 13–18 µm. |
16–23 µm. |
Sporophytes | 1 per perichaetium. |
1 per perichaetium. |
Fissidens taxifolius |
Fissidens osmundioides |
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Habitat | Damp, shaded soil, humus, and rocks | |
Distribution |
AL; AR; AZ; CA; DC; DE; FL; GA; IA; IL; IN; KS; KY; LA; MA; ME; MI; MO; MS; NC; NE; NH; NJ; NY; OH; OK; OR; PA; SC; TN; TX; VA; VT; WA; WI; WV; NS; NT; ON; PE; QC; Mexico; Central America; West Indies; South America (Brazil and Chile); Europe; Asia (China, Japan); Pacific Islands (New Zealand)
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AK; AL; AR; CO; GA; IA; ID; IL; IN; KS; KY; MA; ME; MI; MN; MO; MT; NC; NH; NJ; NY; OH; OK; OR; PA; TN; VA; VT; WA; WI; WV; AB; BC; MB; NB; NF; NS; NT; NU; ON; QC; YT; Greenland; Europe; Asia |
Discussion | 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 osmundioides is distinguished by its papillose rhizoids, evenly crenulate-serrulate leaf margin, broadly acute to obtuse and sometimes apiculate leaf apex, costa that ends well before the leaf apex, and terminal sporophytes. It is most apt to be confused with F. adianthoides, which has smooth rhizoids, irregularly serrate leaf apex, a band of lighter marginal cells, and sporophytes in the axils of proximal leaves. Generally in moist, shaded sites of acidic and basic rocks and boulders that are sometimes subject to spray, soil and humus in seepage areas, meadows, swamps, and fens, around bases of trees (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 27, p. 341. | FNA vol. 27, p. 340. |
Parent taxa | Fissidentaceae > Fissidens | Fissidentaceae > Fissidens |
Sibling taxa | ||
Synonyms | F. clebschii | |
Name authority | Hedwig: Sp. Musc. Frond., 155, plate 39, figs. 1–5. (1801) | Hedwig: Sp. Musc. Frond., 153, plate 40, figs. 7–11. (1801) |
Web links |