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fissidens moss, yew-leaf pocket moss

polypody fissidens moss

Habit Plants to 11 × 3.5 mm. Plants to 50 × 6.5 mm.
Stem

mostly branched;

axillary hyaline nodules absent;

central strand present.

unbranched and 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.

as many as 80 pairs, somewhat undulate, oblong, obtuse to broadly acute, usually bluntly mucronate, to 4 × 1 mm;

dorsal lamina rounded proximally, ending at insertion;

vaginant laminae 1/2 the leaf length, acute, ± equal, minor lamina ending on or near margin;

margin entire but denticulate distally, elimbate;

costa percurrent to ending 2–4 cells before apex, taxifolius-type;

laminal cells 1-stratose, distinct, smooth, slightly bulging, firm-walled, irregularly hexagonal, 10–20 µm, larger juxtacostally, smaller at margin.

Seta

to 17 mm.

to 15 mm.

Sexual condition

rhizautoicous;

perigonia on short branches proximal to elongate stems;

perichaetia on short, proximal, axillary branches.

dioicous;

perigonia and perichaetia on short axillary branches and main stems.

Capsule

theca slightly inclined, slightly arcuate, bilaterally symmetric, to 1.5 mm;

peristome taxifolius-type;

operculum to 1 mm.

theca slightly inclined, radially symmetric or slightly arcuate, bilaterally symmetric, to 2.5 mm;

operculum about as long as theca.

Calyptra

cucullate, smooth, to 2 mm.

cucullate, smooth, 1.5–1.55 mm.

Spores

13–18 µm.

9–11 µm.

Sporophytes

1 per perichaetium.

1–2 per perichaetium.

Fissidens taxifolius

Fissidens polypodioides

Habitat Damp, shaded soil, humus, and rocks Calcareous soil, and limestone rocks and boulders along streams and in ravines
Distribution
from FNA
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)
[WildflowerSearch map]
from FNA
AL; FL; GA; IN; LA; MS; NC; SC; TX; Mexico; Central America; South America; West Indies; 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 polypodioides is a robust species and has its greatest distribution in the neotropics and Asia. It is perhaps the handsomest species of the genus in the flora area. However, it might be confused with F. asplenioides, from which it is distinguished by taxifolius-type costa, leaves crisped but not curled tightly inward when dry, entire leaf margin, acute and more or less equal vaginant laminae, larger laminal cells that are not lenticularly thickened, and absent differentiated medial marginal cells in the vaginant laminae. The central strand is especially well developed. H. A. Crum and L. E. Anderson (1965, 1981) published illustrations of F. polypodioides and F. asplenioides that aid greatly in distinguishing the two.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 27, p. 341. FNA vol. 27, p. 339.
Parent taxa Fissidentaceae > Fissidens Fissidentaceae > Fissidens
Sibling taxa
F. adianthoides, F. amoenus, F. aphelotaxifolius, F. appalachensis, F. arcticus, F. asplenioides, F. bryoides, F. bushii, F. closteri, F. crispus, F. curvatus, F. dubius, F. elegans, F. exilis, F. fontanus, F. grandifrons, F. hallianus, F. hyalinus, F. leptophyllus, F. littlei, F. minutulus, F. obtusifolius, F. osmundioides, F. pallidinervis, F. pauperculus, F. pellucidus, F. polypodioides, F. santa-clarensis, F. scalaris, F. serratus, F. subbasilaris, F. sublimbatus, F. submarginatus, F. taylorii, F. ventricosus, F. zollingeri
F. adianthoides, F. amoenus, F. aphelotaxifolius, F. appalachensis, F. arcticus, F. asplenioides, F. bryoides, F. bushii, F. closteri, F. crispus, F. curvatus, F. dubius, F. elegans, F. exilis, F. fontanus, F. grandifrons, F. hallianus, F. hyalinus, F. leptophyllus, F. littlei, F. minutulus, F. obtusifolius, F. osmundioides, F. pallidinervis, F. pauperculus, F. pellucidus, F. santa-clarensis, F. scalaris, F. serratus, F. subbasilaris, F. sublimbatus, F. submarginatus, F. taxifolius, F. taylorii, F. ventricosus, F. zollingeri
Synonyms F. clebschii
Name authority Hedwig: Sp. Musc. Frond., 155, plate 39, figs. 1–5. (1801) Hedwig: Sp. Musc. Frond., 154. (1801)
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