ICONES MUSCOIUM. 98 



PHYSCOMTTRIUM IMMERSUM, Suttiv. 



Tab. 56. 



Plants humiles, annuae, gregariae vel caespitulos laxos laete 

 virides efformantes. 



Caulis 2-4 lineas altns, simplex vel innovando-ramosus, in- 

 ferne radiculis copiose instructus. 



Folia majuscula, mollia, obovato- vel lingulato-lanceolata, acu- 

 minata, e medio ad apicem serrata ; costa percurrente ; reti laxo 

 amplo, cellulis superioribus oblongo-hexagonis, inferioribus ma- 

 joribus oblongis, marginalibus plus minus luteolis. 



Flores monoici : flos masculus in caule juniore terminalis, 

 tandem innovatione fertili sub eo egrediente ad latus dejectus ; 

 paraphysibus apice maxime inflatis. 



Capsula immersa, subglobosa, operculo magno alte convexo- 

 apiculato delapso hemisphserica, collo indistincto ; pedicello bre- 

 vissimo ; calyptra erecta longirostra basi subquadriloba vix ad 

 operculi medium descendente. 



Physcomitrium immersum, Sulliv. in Gray, Man. Bot. ed. 1, 1848 ; 



Mosses U. States, p. 51, t. 4 ; Muse. Cubenses, No. 7. 

 Physcomitrium sph^ericum var. ? Sulliv. Muse. Alleghan. No. 196. 



Hab. River banks, Southern Ohio, Lea. Western Pennsyl- 

 vania, Lesquereux. Island of Cuba, Wright. South Caro- 

 lina, 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 mar- 

 gins. 



In size and external appearance Physcomitrium immersum ap- 

 proaches very closely the next species, Aphanorhegma serratum, 



