Ephemerum crassinervium

(Schwägrichen) Hampe

Flora 20: 285. 1837,.

Basionym: Phascum crassinervium Schwägrichen Sp. Musc. Frond. Suppl. 1(1): 4, plate 2. 1811
Treatment appears in FNA Volume 27. Treatment on page 651. Mentioned on page 650, 652.

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.


V27 961-distribution-map.gif

North America, Europe, e Asia, Pacific Islands (New Zealand).


Varieties 2 (2 in the flora).

Selected References



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