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BFNA | Family List | BFNA Vol. 1 | Ephemeraceae | Ephemerum

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

  • Phascum crassinervium Schwägrichen

    Plants less than 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 ´ 35 to 120 ´ 80 µm

    Varieties 2 (2 in the flora): North America, Europe.

    1 Distal leaves lanceolate to broadly linear and acuminate, with compact to rather dense areolation in the distal two-thirds.   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.   Ephemerum crassinervium var. texanum

    Lower Taxa

    Related Synonym(s):


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