MNIACE,E.] 238 [Mnium. 



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. MNIUM 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. Mnium serratum Var. /3. SCHWAEG. Suppl. I, P. II, 129, t. 78 (1816). 

 Mnium serratum ft. Penn'mum DE NOT. Syllab. 139 (1838). 



Mnium orthorrhynchum (non BRID.) BR. SCH. Bry. eur. fasc. 5, p. 25, t. 5 (1838). 

 RABENH. 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 (1860), 2 ed. 482. BERK. Handb. br. m. 185 (1863). LINDB. Not. ur Saell^k. Fn. 

 Fl. fenn. ix, 49 (1867). MILDE Bry. siles. 229 (1869). DE NOT. Epilogo 364 (1869). 

 HOBK. Synops. 122 (1873). JURATZ. Laubm. ocster.-ung. 301 (1882). BOULAY Muse. 

 Fr. 234 (1884). LESQ. JAMES Moss. N. Amer. 246 (1884). HUSN. Muse. gall. 255, 

 t. 70 (1885). LIMPR. in RABENH. D. kr. fl. Lauhm. ii, 455 (1893). 



Mnium marginatum /3. orthorrhynchum HARTM. Skand. fl. 5 ed. 345 (1849). 

 Astrophyllnm orthorr.hynchum 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, lirnb 

 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. (Now ell 1856)!! Ingleboro, on the Yoredale limestone at 

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

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

 1890) ! ! Lodore, Cumberland (Binstead 1889) ! ! 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 hovnum. 



5. MNIUM HORNUM L. 



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

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

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



