DICRANUM. 57 



l>y the smaller size, and perhaps by its somewhat wider cap- 

 sule ; but even in this last particular we find native speci- 

 mens of our plant to vary. If we may pronounce from 

 Schwaegrichen's figure and description, we should suppose 

 his ). Hostianum to be also the same as our plant. 



D. polycarpum ; stems branched ; leaves patent, directed 

 to every side, lanceolato-subulate, their margins recurved, 

 flexuose, subserrulate, crisped when dry ; capsule obovate, 

 subcernuous; lid rostrate. (TAB. XVIII.) 



D. polycarpum. Ehrh. Crypt. No. 84. (according to Smith.) Engl. 

 Bot. t. 2269.. Moug. et Nestl. n f 414. Fissidens polycarpus. Hedw, 

 St. Cr. v. 2. t. 31. D. Bruntoni. Engl. Bot. t. 2509. 



HAB. On rocks. 



This plant may at first sight be easily confounded with a 

 small variety of the preceding; viz. D. montanum Hedw. 

 It differs however by the leaves being larger and wider, by 

 their less rigid texture, and more particularly by the mar- 

 gins being recurved ; besides, in the lid not being above 

 half as long as the capsule, while in the former the lid and 

 capsule are equal to one another. We find upon examina- 

 tion D. Bruntoni Engl. Bot. to be only a small variety 

 of our plant. The teeth of the peristome will be found to 

 be irregularly divided. 



p. undulatum ; stems elongated ; leaves nearly plane, lan- 

 ceolate, attenuate, serrulate at the points, transversely un- 

 dulate ; capsule cylindraceous, cernuous ; lid with a long 

 beak. (TAB. XVIII.) 



D. undulatum. Ehrhart. (not of Schrader.) Turn. Muse. Hib. p. 59, 

 Engl. Bot. t. 2260. D. polysetum. Swartz.Schwaegr. SuppL t.4l. 



HAB. In woods, also on rocks. 



This species, which was confounded by the older bota- 

 nists with D. scoparium, as well as the foreign D. Schra- 

 deri, bears the more striking resemblance to the latter, whose 

 property is however to have more obtuse and carinate leaves, 

 with their nerve disappearing before the points. With 

 D. scoparium our plant agrees, in having very remarkable 

 perichaetia, one of which incloses two, three, and even four 

 fruitstalks : in some foreign species allied to this we have 

 seen as many as seven. The transverse undulations of the 

 leaves may be perceived on the plant while growing, al- 

 though this appearance becomes more striking in dried spe- 

 cimens. 



P. scoparium ; stems elongated ; leaves narrow, subulate, 



