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FNA | Family List | FNA Vol. 27 | Ephemeraceae | Ephemerum

3b. Ephemerum crassinervium var. texanum (Grout) V. S. Bryan & L. E. Anderson, Bryologist. 60: 73. 1957.

Ephemerum spinulosum var. texanum Grout, Moss Fl. N. Amer. 2: 70. 1935

Plants less than 2.2 mm. Leaves broadly lanceolate to oblong-lanceolate or ligulate and acuminate, often narrowed distally from slight to prominent shoulders, 0.8-2.4 × 0.17-0.27 mm; margins serrate distal to the proximal third, often with narrow shoulders bearing one or more teeth; apex acuminate, toothed, and densely papillose in the distal half; costa thin at base, percurrent or excurrent; areolation markedly dense distally; median laminal cells slightly papillose; distal laminal cells densely papillose. Capsule with few stomates, scattered throughout. Spores various, commonly sub-globose, 68-120 × 50-80 µm, dark brown.

Capsules mature year around, mostly in spring, autumn, and winter. Moist or drying soil, frequently in old fields, on roadsides, or in mixed forests; low to moderate elevations (50-600 m); Ont.; Ala., Ark., Fla., Ga., Ill., Ind., Iowa, Kans., La., Minn., Miss., N.J., N.Y., N.C., Ohio, Okla., Pa., S.C., Tenn., Tex., W.Va.

Variety texanum is distinguishable largely by the dense papillosity of the distal half of the leaves. Secondarily, the lanceolate leaf shape, modified by more or less evident shoulders at the base of the acumen, confirms a determination.


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