ORTHOTRICHUM STRANGULATUM, Beauv.
Tab. 36.
Plantæ pusillæ, fastigiato-ramosæ, in pulvinulis laxiusculis luteo-viridibus inferne fuscis degentes.
Caulis 4–7 lineas altus, crassus, dense foliosus.
Folia patula, lineali-lanceolata, obtusiuscula, carinato-costata, tota longitudine margine revoluta, superne e cellulis papillulosis rotundis densius areolata, inferne laxius texta; perichaetialia longiora, erecta, subvaginantia.
Flores monoici: masculi axillares; antheridiis longe pedicellatis paraphysatis.
Capsula emergens, oblongo-obovata vel subelliptica, sicca et vacua prominenter 8-costata, angustissima, sub ore coarctata, vetusta sordide rubescens; pedicello capsula quintuplo breviore; vaginulæ pilosæ tubo adauctrice amplo pedicellum totum capsulæque basin investiente; calyptra glabra vel raripila fusca; operculo conico-apiculato; peristomii dentibus 8 bigeminatis pallide rufescentibus granulatis, siccis reflexis; ciliis 8 filiformibus e duplici (nec simplici ut in icone) serie cellularum exstructis.
Orthotrichum strangulatum, Beauv. Prodr. p. 81; Schwægr. Suppl. t. 34; Sulliv. Musc. Alleghan. No. 128; Mosses U. States, p. 33; Sulliv. & Lesqx. Musc. Bor.-Amer. Exsicc. (ed. 1), No. 120.
Hab. Trees, rarely on rocks: common.
A small species, with short and thick stems, and densely crowded greenish-yellow foliage; the empty capsule when dry very narrow, the dark-red costæ being in contact throughout its entire length. It is often confounded with another closely related and common species, probably O. Canadense, Br. &. Sch. (London Jour. Bot. 1843, p. 007), not of Müler; which is dis-
