124 BRYUM. 



HAB. Mountains, especially in clefts of the rocks and iff 

 caves. 



We can perceive no difference between Mr. Dickson's 

 Bryum cylivdricum and his elongatum ; and the Bryum 

 longicollum of Swartz, judging from the specimens we have 

 received of it, is only a large variety ; as Pohlia minor is a 

 smaller state of the plant. Of this latter we have authentic 

 specimens, in which the leaves are often as narrow as in the 

 common appearance. 



Br. elongatum is nearly allied to Br. crudum ; but that , 

 species has much longer and more leafy stems, with an i 

 evlrnescent nerve and a shorter capsule. In both the leaves j 

 possess the same rigid and glossy texture ; and in this re- 

 spect are allied to Br. nutans. The peristome is that of a 

 Pohlia. 



18. Br. dlplnum \ stems rigid, elongated, branched; leaves 

 closely imbricated, erect, lanceolate, somewhat obtuse, sub- 

 serrulate at the apex, margins revolute, nerve reaching to 

 the points ; capsules oblongo-ovate, pendulous. (TAB. 

 XXVIII.) 



Br. alpinum. Linn. Mant. v. 2. p. 309. Turn. Muse. Hib. p. 125. 

 Engl Bot. t. 1623. Moug. et Nestl. n. 221. Schwaegr. Suppl t. 73. 

 Dill. Muse. t. 50. /. 64. 



HAB. On rocks in subalpine countries, common. 



This species is best known by its deep shining purple co- 

 lour, its rigid stems and leaves, which latter are straight as 

 well when dry as when moist. It is nevertheless difficult 

 to form a specific character that will separate it from some 

 of the varieties of Bryum ventricos?jm. We do not observe 

 the leaves to be f< octofariam imlricata" as Schwaegri- 

 chen describes them. 



ID. Br. ventricosum ; stems elongated, branched with innova- 

 tions ; leaves oblong, acuminated, scarcely serrulate, mar- 

 gins recurved, nerve reaching beyond the point ; capsule 

 oblongo-obovate, pendulous. (TAB. XXX.) 



Br. ventricosum. Dicks. PL Crypt, fasc. 1. p. 4. Turn. Muse. Hib. 

 p. 126. Engl Bot. t. 2270. Bryum binum. Schreb. FL Lip?, p. S3. 

 Turn. Muse. Hib. p. 127. Engl Bot. t. 1518. Moug. et Nestl n. 223. 

 Br. cubitale. Dicks. PI Crypt, fasc. 2. t. 5. Engl. Bot. t. 2554. Mnium 

 pseudo-triquetrum. Hedw. St. Cr. v. 3. t. 7. Dill Muse, t.bl.f. 72, 

 73. 



HAB. Marshy ground and in wet places in the crevices 

 of rocks. 

 * We have carefully examined authentic specimens of all 



