(modifié de Coste, Flore de la France 1937) :
Plante vivace, printanière, très robuste; tiges de, deux sortes, les fertiles de 20-40 cm, simples, lisses, d'un blanc rougeâtre, paraissant avant les stériles et périssant après la fructification ;
Écologie : Lieux humides et argileux, dans presque toute la France et en Corse.
Répartition hors de France : Europe ; Asie tempérée; Afrique et Amérique boréales.
(modified from Butcher, British Flora 1961):
NOTE: the French text is more complete and up-to-date
A large, robust plant with simple, brown, fruiting stem 8-30 cm high, and erect, branched barren stems 60-150 cm high. Stems of two kinds, fertile and sterile; the former appearing first, simple and brown, dying after sporulation; the latter appearing later, stout, green, smooth, striate, with whorls of numerous, fine, regular, spreading branches; in cross-section showing an almost entire, circular outline, numerous small lacunae and a central space much larger than the outer tissue.
Ecology UK: (distribution according to flora) It grows, at times abundantly, in wet, shady banks and ditches throughout the lowland parts of the British lsles, but more rarely in Scotland, and absent from the north-east. .
Fleurs : aucune
Formation des spores, France : Mars-mai.
Flowers: none
Spore formation UK: Early April-early May
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