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Rh EPHEMERUM CRASSINERVIUM, (Schwægr.) Hampe.

Tab. 8.

annuæ, minimæ, subacaules, gregariæ, in prothallio byssoideo persistente nidulantes.

brevissimus, crectus, simplex, congesto-foliosus, basi radiculosus.

10–12, c basi lanceolata subulata, flexuoso-erecta, rigidula, capsulam longo superantia, laxe elongato-rhomboideo-areolata, superne papillosa, apiceni versus costasque dorso plus minus grosse serrata vel irregulariter dentata; costa basi baud raro subevanida cum apice desinente.

dioici: planta mascula gemmiformis, 3–5-phylla, ad feminei basin sessilis; antheridiis 2–3.

immersa, sphærica, mammillata, in pedicello brevissimo; calyptra dimidiato-mitriformis, basi parce lacera; columella fugacissima; sporis majusculis subrotundis papillosis.

Moist clayey ground, roadsides, river-banks, &c.

A very variable species: leaves more or less papillose on both surfaces, their margins slightly serrate or spinulose and runcinate-dentate. The typical form here figured is readily connected by intermediates with E. spinulosum, ''Br. & Sch.''

TAB. 8.—