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Rh APHANORHEGMA SERRATUM, Sulliv.

Tab. 57.

lmmiles, teneræ, annuæ vel bi-triennes, gregariæ, vel cæspitulos laxos pallide viresccntes formantcs, basi sola radiculosæ.

erectus, 3–7 lineas attingens, primo simplex, dein bis terve dichotome innovando-ramosus.

mollia, inferiore in caule elongato remota, flexuosopatula; superiora approximata, erectiuscula, oblongo-et spatbulato-lanceolata, brevius acuminata, supra medium serrata, ad apicem usque tenui-costata, laxe bexagono-areolata; cellulis basilaribus majoribus oblongis rectangulis, marginalibus sæpe luteo tinctis.

monoici et synoici: antberidiis 6–12 fasciculatis nudis vel uno alterove folio perigoniali minimo comitatis in comalium axillis rarius ad vaginulas basin positis; parapbysibus longioribus apice maxime globoso-inflatis.

immersa, brevissime pedicellata, spbaerica, vertice minute papillata, in medio rima baud discolore valcle obscura circumcisse debiscens; calyptra conico-mitrasformi 5–6-lobata vix ad operculi medium porrecta; sporis tuberculatis.

Damp ground, river-banks, sliaded roadsides, &c., New Jersey, Pennsylvania, and Western Missouri.—Not uncommon.