Fissidens subbasilaris |
Fissidens osmundioides |
|
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fissidens moss |
osmund fissidens moss |
|
Habit | Plants to 12 × 1.5–3.5 mm. | Plants 2–21 × 2–3 mm. |
Stem | branched; axillary hyaline nodules absent; central strand present. |
sparingly branched; axillary hyaline nodules absent; central strand present. |
Leaves | as many as 28 pairs, sometimes ± undulate, oblong, obtuse-apiculate to acute, to 2.4 × 0.3–0.4 mm; dorsal lamina narrowed proximally, ending before or at insertion; vaginant laminae 1/2–2/3 leaf length, acute, ± unequal, minor lamina ending near margin; margin evenly crenulate-serrulate but irregularly serrate distally; costa ending 6–16 cells before apex, covered and obscured above by chlorophyllose cells, taxifolius-type; lamina cells irregularly 2-stratose, smooth, bulging, firm-walled, irregularly rounded-hexagonal, 7.5–10 µm. Sexual condition gonioautoicous and cladautoicous; perigonia gemmiform, axillary, and on short branches; perichaetia on short axillary branches near proximal ends of stem. |
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. Sexual condition dioicous; perigonia and perichaetia on elongate stems. |
Seta | 1.5–5.5 mm. |
2–2.5 mm. |
Capsule | theca 0.8–2.1 mm, erect, radially symmetric or nearly so; peristome taxifolius-type; operculum long rostrate, 0.6–0.9 mm. |
theca erect, bilaterally symmetric, to 1 mm; peristome taxifolius-type; operculum 1 mm. |
Calyptra | cucullate, smooth, 1.5 mm. |
mitrate, smooth, 1.5 mm. |
Spores | 13–18 µm. |
16–23 µm. |
Sporophytes | 1 per perichaetium. |
1 per perichaetium. |
Fissidens subbasilaris |
Fissidens osmundioides |
|
Habitat | Particularly around bases of trees, also rocks, mostly limestone, infrequently decaying wood | |
Distribution |
AL; AR; FL; GA; IA; IL; IN; KS; KY; LA; MA; MD; ME; MI; MO; MS; NC; NH; NY; OH; OK; PA; SC; TN; TX; VA; WI; WV; ON; QC; Mexico (San Luis Potosí, Tamaulipas)
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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 subbasilaris is distinguished, even in the field, by a costa obscured by chlorophyllose cells distally, and short perichaetial branches in the axils of proximal leaves. The plants are typically dark-green and often tinged with red. (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. 342. | FNA vol. 27, p. 340. |
Parent taxa | Fissidentaceae > Fissidens | Fissidentaceae > Fissidens |
Sibling taxa | ||
Name authority | Hedwig: Sp. Musc. Frond., 155, plate 39, figs. 6–9. (1801) | Hedwig: Sp. Musc. Frond., 153, plate 40, figs. 7–11. (1801) |
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