Fissidens taxifolius |
Fissidens hallianus |
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fissidens moss, yew-leaf pocket moss |
fissidens moss |
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Habit | Plants to 11 × 3.5 mm. | Plants to 120 × 6 mm. |
Stem | mostly branched; axillary hyaline nodules absent; central strand present. |
usually profusely branched; axillary hyaline nodules absent; central strand absent. |
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 numerous pairs, lanceolate to linear-lanceolate, acute, to 6.5 × 0.7 mm; dorsal lamina narrowed proximally, usually ending before insertion; vaginant laminae 1/4–1/2 leaf length, acute, unequal in most leaves, minor lamina rounded above, attached on or near costa, ± equal on proximal part of stem, minor lamina ending near leaf margin; margin ± entire, elimbate or limbate in the proximal 2/3 or less of vaginant laminae; costa ending 5–15 cells before apex, bryoides-type; laminal cells 1-stratose, distinct, smooth, slightly bulging, ± firm-walled, quadrate to oblong to hexagonal, 10–15 × 9–11 µm. |
Seta | to 17 mm. |
0.7–1.5 mm, often bent at the vaginula. |
Sexual condition | rhizautoicous; perigonia on short branches proximal to elongate stems; perichaetia on short, proximal, axillary branches. |
cladautoicous; perigonia on elongate, axillary branches; perichaetia terminal on mains stems and elongate, axillary branches. |
Capsule | theca slightly inclined, slightly arcuate, bilaterally symmetric, to 1.5 mm; peristome taxifolius-type; operculum to 1 mm. |
theca erect, radially symmetric, 0.4–0.8 mm; peristome anomalous, teeth variable, undivided and often fenestrate to divided 2/3 their length, even in same capsule, nearly smooth to papillose proximally, filaments with straight or spiral thickenings or striations; operculum 0.4–0.6 mm. |
Calyptra | cucullate, smooth, to 2 mm. |
not seen. |
Spores | 13–18 µm. |
14–32 µm. |
Sporophytes | 1 per perichaetium. |
1–2 per perichaetium. |
Fissidens taxifolius |
Fissidens hallianus |
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Habitat | Damp, shaded soil, humus, and rocks | Flowing and non-flowing water over limestone, granite, and bases of trees, especially abundant in Taxodium-Nyssa swamps |
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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FL; IL; LA; MA; MS; NC; NJ; TX |
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 hallianus, named for Elihu Hall, has been confused with F. fontanus; they can be found growing together and both have similar vaginant laminae, although in F. hallianus there can be a weak limbidiuim on the proximal margin. Moreover, the costa is longer in F. hallianus than in F. fontanus. The sporophytes of F. hallianus are terminal, the number per perichaetium usually fewer than in F. fontanus, the seta is longer, relative to the length of the capsule, and the peristome teeth are complete. Sexual reproduction appears to be dependent on seasonal exposure. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 27, p. 341. | FNA vol. 27, p. 344. |
Parent taxa | Fissidentaceae > Fissidens | Fissidentaceae > Fissidens |
Sibling taxa | ||
Synonyms | F. clebschii | Conomitrium hallianum, F. manateensis, Octodiceras hallianum |
Name authority | Hedwig: Sp. Musc. Frond., 155, plate 39, figs. 1–5. (1801) | (Sullivant & Lesquereux) Mitten: J. Linn. Soc., Bot. 21: 560. (1885) |
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