PTYCHOMITRIUM INCURVUM, Schwægr.
Tab. 39.
Plantæ pusillæ, laxe cæspitosæ, rigidulæ, saturate virides, a'tate fusco-flavescentes.
Caulis 2–3-lincaris, simplex vel parcc innovando-ramosus, conferte foliosus.
Folia erecta vel incurvulo-erecta, siccitate cirrhato-crispata, lineali-lanceolata, obtusa, crassiuscula, opaca, leniter canaliculata, marginibus plana; costa lata cum vel sub apice evanida; cellulis minutis densis quadratis valde chlorophyllosis, angularibus oblongis majoribus laxioribus translucidis: perichaetialia comalibus similia.
Flores monoici: masculi gemmacei, axillares vel cladogeni; paraphysibus subnullis.
Capsula ovalis, erecta, brevi-pedicellata; peristomii dentibus 16 longis subulatis remote nodoso-articulatis hic illic linea divisuriali notatis nunquam in crura solutis pallide rufo-purpureis papillosis; annulo specioso; operculo conico-aciculari recto; calyptra mitraeformi longirostra plicata infra capsulam mediam producta, matura profunde 8–10-laciniata.
Ptychomitrium incurvum, Schwægr.; Br. & Sch.; Sulliv. Mosses U. States, p. 35.
Ptychomitrium pusillum, Br. et Sch. in Lond. Jour. Bot. 1843, p. 665; Sulliv. Musc. Alleghan. No. 135.
Weisia incurva, Schwægr. Suppl. t. 116.
Grimmia Muhlenbergii, Brid. Bryol. Univ. 1, p. 181.
Grimmia Hookeri, Drumm. Musc. Amer., No. 61.
Notarisia Virginica, Hampe in Linnæa, 11, p. 379.
Brachysteleum Hampeanum, C. Mull, in Linnasa, 17, p. 597.
Brachysteleum incurvum, C. Mull. Synop. Musc. 1, p. 770.
Hab. On exposed rocks, Eastern New York, and southward to Georgia; also Southern Ohio.
