HYPNACE/E.] 



-3 \Plagiothecium. 



22. PLAGIOTHECIUM Schimp. 



Bry. Europ. fasc. 48 (1851). 



Plants prostrate or ascending; sparingly and irregularly branched, 

 stoloniferous. Leaves compressed or rarely equal on all sides, decurrent, 

 inserted obliquely; nerves two, short or obsolete ; cells pellucid, narrow, 

 hexagono-rhomboid. Capsule smooth or more rarely plicate, erect or 

 inclined, oval or oblong, subincurved, leptodermous ; lid convex-conic, 

 pointed 'or rostrate; peristome pale, the teeth densely articulated; cilia 

 of endostome short, more or less perfect, sometimes none. Growing on 

 moist woodland banks, tree-roots and in shaded clefts of rocks. Der. 

 77X07409 oblique, and Qi)Kt] a capsule. 



This fine genus of about 86 species is a natural one, and easily recognised, 

 but some of the species come so near to each other that it is difficult to separate 

 them. 



CLAVIS TO THE SPECIES. 



Leaves spreading on all sides, squarrose. stnatellum. 



- compressed, the lateral bifarious. 



Leaves transversely undulate. undulatum. 



- not undulate. 



Autoicous, very glossy. denticulatum. 



Polygamous, robust, prim, utricle not separating from cell-wall, 



lid conical. succulentum. 



Dioicous, robust, prim, utricle contracted in a serpentine form, 



lid rostrate. silvaticum. 



- very small and slender, capsule erect. latebricola. 



i. PLAGIOTHECIUM STRIATELLTJM (Brid.) Lindb. 



Autoicous ; prostrate, densely tufted, the branches fasciculate. Leaves 

 spreading, squarrose and secund, deltoid-ovate, acuminate, serrulate ; nerves 

 none or two short ones. Capsule oblong, suberect, with a long neck, 

 striated when dry; lid conical. (T. CXVII, B.) 



SYN. //#>MMW Silesianunt (non SELIGER) SMITH Eng. Bot. t. 2016 (1808). HOOK. TAYL. Muse. 

 Brit. 113 (1818). GRAY Nat. Air. Br. pi. i, 765 (1821). 



Leskea slriatella BRID. Bry. univ. ii, 762 (1827). 



Muehlenbeckii BR. SCH. MSS. SPRUCE in Ann. Mag. nat. Hist. 2 ser. iii, 275, 

 name only (1849). HARTM. Skand. Fl. 6 ed. p. 346 (1854). WILS. Bry. Brit. 404, t. 59 

 O8S5)- RABENH. D. kr. fl. II, s. 2, 274 (1848). BERK. Handb. 129 (1863). HOBK. 

 Synops. 160 (1873). LESQ. JAMES Moss. N. Amer. 370 (1884). 



Hypnum chrysophylloides GUEMBEL in C. MUELL. Synops. ii, 436 (1851). 



Hypnum striatellum C. MUELL. Synops. ii, 282 (1851). BOUL. Muse. Fr. 88 (1884). 



Plagiotheaum Muehlenbeckii BR. SCH. Bry. Eur. fasc. 48, p. u, t. 6 (1851). SCHIMP. Synops. 

 >oo), 2 ed. 702. MILDE Bry. Siles. 320 (1869). DE NOT. Epilogo 190 (1869). 



Plagiothedum striatellum LINDB. Bot. Notis. 1865, p. 144, et Notis. ur Saells. Fn. Fl. fenn. 

 ^8AA^ P i 32 ' - N - Musc> gall< 354, t. 101 (1894). Dix. JAMES. Stud. Handb. 434 

 (1896). LIMPR. , n RABENH. D. kr. fl. Laubm. iii, 273, fig. 395 (1897). 



