MNiACEiE.] 238 [Mniiim. 



the latter, and also erroneously refers M. lycopodioides to it. Like several 

 other mosses growing by streams, it is liable to be covered by floods and 

 hence charged with sand and dirt. It differs from M. orthorrhynchum in the 

 colour and laxer areolation of the more distant leaves, and is altogether a 

 smaller plant. The male and sterile specimens have alone been found here. 



4. MNITJM ORTHORRHYNCHUM Br. Sch. 



Dioicous ; more robust. Leaves longer and narrower, dense, dull 

 green, ovato- lanceolate, with two rows of teeth in upper half, minutely 

 areolate. Capsule oval. (T. LXXXI, D.) 



Syn. — Mnitim serratum Var. /?. Schwaeg. Suppl. I, P. II, 129, t. 78 (1816). 

 Mnium serratum fi. Penninum De Not. Syllab. 139 (1838). 



Milium orthorrhynchum (non Brid.) Br. Sch. Bry. eur. fasc. 5, p. 25, t. 5 (1838). 

 Raeenh. D. kr. fl. ii, S. 3, 226 (1848). C. Muell. Synops. i, 163 (1849). Spruce in 

 Tr. Bot. soc. Edin. iii, 159 (1849). WiLS. Bry. brit. 255, p.p. (1855). Schimp. Synops. 

 392 (i860), 2 ed. 482. Berk. Handb. br. m. 185 (1863). Lindb. Not. ur Raellsk. Fn. 

 Fl. fenn. ix, 49 (1867). Milde Bry. siles. 229 (1869). De Not. Epilogo 364 (1869). 

 HoBK. Synops. 122 (1873). Juratz. Laubm. ooter.-ung. 301 (1882). Boulay Muse. 

 Fr. 234 (1884). Lesq. James Moss. N. Amer. 246 (1884). Husn. Muse. gall. 255, 

 t. 70 (iSSg). LiMPR. in Rabenh. D. kr. fl. Laubm. ii, 455 (1893). 



Mnium marginatum jS. orthorrhyn chum Hartm. Skand. fl. 5 ed. 345 (1849). 



AstrophyUum orthorrhynchum Lindb. Muse, scand. 14 (1879). 



Dioicous ; more robust, densely matted, dull green above, reddish 



at base. Stem taller, densely leafy. Leaves erecto-patent, ovato- 



lanceolate, the lower nearly entire, somewhat twisted when dry, limb 



narrow, doubly serrate in the upper half, nerve red, ending in the 



point, and serrate at back ; cells not in rows, roundish-angular, 



•018 — "025 mm. in diameter, strongly incrassate. Seta longer, red 



below, yellow above, caps, cernuous pale brown, oval, lid conic, shortly 



rostrate, peristome yellow-green. Male plants shorter with stout 



discoid many-bracted inflorescence. 



Hab. — Wet rocks and stony places in limestone districts. Fr. 7. 



Arncliff Clouder, Yorks. c. fr, (Nuwell 1856) ! ! Ingleboro, on the Yoredale limestone at 

 2,000 ft. (Nowell 1858) ! ! Hazelden Gill {Hunt 1867) ! ! Litton Dale c. fr. (Whitehead 

 and Ashton 1879) I ! On elder stumps in a marsh at Pont Esgob, Hereford (Aug, Ley 

 i8go) ! I Lodore, Cumberland (Binstead i88g) ! ! Stock Ghyll force, Ambleside and 

 Naddle Forest (Binstead 1893) ! ! 



Taller, dense-leaved and more rigid than the last species, with much 

 smaller areolation, and in habit resembling Mnium hornum. 



5. MNIUM HORNUM L. 



Dioicous ; in dense dark green tufts. Leaves oblong-lanc, 

 slightly decurrent, bispinoso-serrate, the nerve vanishing below apex. 

 Caps, oblong-ovate, subpendulous, lid mamillate. (T. LXXXII, C.) 



