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Rh PHYSCOMTTRIUM IMMERSUM, Sulliv. Tab. 56. humiles, annuæ, gregariæ vel caespitulos laxos læte virides efformantes.

2–4 lineas altns, simplex vel innovando-ramosus, inferne radiculis copiose instructus.

majuscula, mollia, obovato-vel lingulato-lanceolata, acuminata, e medio ad apicem serrata; costa percurrente; reti laxo amplo, cellulis superioribus oblongo-hexagonis, inferioribus majoribus oblongis, marginalibus plus minus luteolis.

monoici: flos masculus in caule juniore terminalis, tandem innovatione fertili sub eo egrediente ad latus dejectus; paraphysibus apice maxime inflatis.

immersa, subglobosa, operculo magno alte convexo-apiculato delapso hemisphærica, collo indistincto; pedicello brevissimo; calyptra erecta longirostra basi subquadriloba vix ad operculi medium descendente.

River banks, Southern Ohio, Lea. Western Pennsylvania, Lesquereux. Island of Cuba, Wright. South Carolina, Ravenel. The nearly allied Physcomitrium sphcericum has an exserted capsule, with a distinct collum, a larger calyptra, and a smaller operculum, as well as muticous leaves with nearly entire margins.

In size and external appearance Physcomitrium immersum approaches very closely the next species, Aphanorhegma serratum,