68 ICONES MUSCORUM. 



ORTHOTRICHUM PSILOCARPUM, James. 



Tab. 50. 



PLANT.E perpusilloe, casspitosuloe, atro-virides. 



Caulis 2-3 lineas longiis, siibsimplex, fragilis, a basi foliosus. 



Folia ad basin caulis minima, erecto-patentia, superne sensim 

 longiora, crecta, ovato-lanceolata, obtuse acutiuscula, carinato- 

 costata, apice subdenticulata, margine basi revoluta, ad apicem 

 cellulis rotundatis granulosis minute papillosis laxius areolata, 

 basin versus e cellulis quadrato-oblongis texta. 



Flores monoici : masculi gemmiformes, pedicellati ; perigoni- 

 alibus ovatis obtusis ; paraphysibus subnuUis. 



Capsula subimmersa, late ovalis, collo brevissirao instructa, 

 IjBvis, vacua oblongo-cylindrica (nee striato-plicata), leptoderma, 

 epicarpio tenuissimo albicante ; peristomii dentibus 16 geminatis, 

 cruribus inaequalibus granulosis ; ciliis 8 brevioribus gracillimis 

 albidis punctulatis ; operculo plano-convexo obtusiusculo ; ca- 

 lyptra laevi. 



Orthotriciium PSILOCARPUM, James, Trans. Amer Phil. Soe. (1865), 13, 

 p. 110 (Dec. 18G4) ; Siilliv. & Lesqx. Muse. Exsicc. Amer. (ed. 2), No. 180. 

 Orthotrichum pusillum, Mitten? Proe. Linn. Soc. 8, p. 25 (Jan. 18G4). 



Hab. Pennsylvania, on Poplars. New York, Massachusetts, 

 etc., James. South Carolina, Ravenel. 



Mitten's character of 0. pusillum : " tlieca siecitate S-pUcata,''^ 

 does not agree with this species, in which the capsule is neither 

 plicate nor striate. It represents apparently a different species 

 found intermixed with 0. psilocarpum. Specimens comnmni- 

 cated by the English author, however, truly represent this last 

 species. — Specimens of his 0. psilocarpum, with descrij)tion, 

 were distributed by Mr. James several years before its publica- 

 tion, as early as in 1858. 



