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

3. Ephemerum crassinervium (Schwägrichen) Hampe, Flora. 20: 285. 1837.

Phascum crassinervium Schwägrichen, Sp. Musc. Frond. Suppl. 1(1): 4, plate 2. 1811

Plants up to 2.5 mm, scattered in sparse protonemata. Leaves lanceolate, broadly linear or ligulate, acuminate, sometimes narrowed distally from shoulders, 0.8-2.5 × 0.15-0.4 mm; margins serrulate or serrate, with teeth sometimes recurved up to 45°; apex acuminate and papillose; costa at the base thin or not always apparent, stronger distally, often filling the acumen, percurrent or excurrent, papillose; areolation firm proximally and distally compact to dense; median laminal cells in ± vertical rows, smooth or slightly papillose; distal laminal cells papillose. Capsule with columella resorbed before meiosis; stomates in proximal half or scattered throughout. Spores various, 43-120 × 35-80 µm.

Varieties 2 (2 in the flora): North America, Europe, e Asia, Pacific Islands (New Zealand).

1 Distal leaves lanceolate to broadly linear and acuminate, with compact to rather dense areolation in the distal two-thirds   3a Ephemerum crassinervium var. crassinervium
+ Distal leaves broadly lanceolate to oblong-lanceolate or ligulate and subulate, often narrowed from a slight to prominent shoulder, densely papillose in the distal half   3b Ephemerum crassinervium var. texanum


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