ToRTULACEyE.] 271 [Bavbula. 



Tortilla sinuosa Mitt. Journ. Bot. 1867, p. 327. Braithw. in Seem. Journ. Bot. 1871, 

 p. 294, t. 120, f. 6. HoBK. Syn. br. m. 73 (1873). 



Didymodon simiostis Schimp. Synops. 2 ed. 166 (1876). 



Barbula cylindrica var. y. sinuosa Lindb. Muse, scand. 22 (1879). 



Dioicous ; in small dense lurid green tufts, fuscous and radiculose 

 below. Leaves dense, nearly straight, long lineal-lane, from an oval 

 concave base, acute, carinate above, fragile, cirrhate and twisted when 

 dry, strongly verrucoso-papillose, nerved to apex, margin crenulate, 

 more or less sinuose in upper half, flat or lightly recurved, inciso-dentate 

 at apex; cells at base rectangular, pellucid, upper rounded quadrate, 

 obscure. Perigynial bracts narrower, paler. 



Hab. — On old walls, wet stones, and about tree roots, in calcareous districts. 



Bangor (Wilson 1863) ! ! Woolsonbury hill (Mitten) ! ! Arundel and Wiston (Davies 

 1865) ! ! Plymouth and Laira Bridge {Holmes 1868) ! ! Cheedale (Holmes 1875). 

 Phoenix Park, Dublin (Hutton 1865). Witney and Banbury (Boswell 1878) ! ! Monk's 

 dale, Miller's dale and Monsal dale (Ho/i 1883)!! Buckingham (Ho/m^s). Helmsley 

 (Wesley 1877) ! ! Dunton Green, Kent (Holmes). 



I have retained this as a species, although Juratzka, Lindberg, and 

 others, regard it as only a variety of the last. The points of difference are 

 the narrower longer fragile leaves, with the margin sinuous above, denticulate 

 at apex, and recurved towards base. 



12. BARBULA HORNSCHUCHII Schultz. 



Dioicous ; laxly caespitose, slender. Leaves broadly lane, very 

 acute, nearly smooth, nerve stout, excurrent, margin revolute. Caps. 

 elongate ovate, lid rostrate. (T. XLL A.) 



Syn. — Barbula revoluta (non Brid.) Web. Mohr Bot. Tasch. 210 (1807). Schultz F1. 

 starg. Suppl. 69 (i8ig). 



Tortula revoluta (non Schrad.) Hook. Tayl. Muse. br. 33, t. 12 (1818). 



Barbula Hornschuchiana Schultz Reeens. Barb, et Syntr. 217, t. 33, f. 25 (1823). Br. 



Schimp. Bry. eur. fase. 13-15, p. 28, t. 10 (1842), Rabenh. Deutsch. kr. fl. ii, S. 3, 



108 (1848). C. MuELL. Synops. i, 608 (1849). Bertol. Fl. ital. cr. 208 (1858). 



Schimp. Synops. 173 (i860), 2 ed. 212. Milde Bry. siles. 116 (1869). Juratz. Laubm. 



oesterr.-ung. 116 (1882). HuSN. Mouss. nord-ouest 82 (1873), Muse. gall. 107, t. 30 



(1886). 



B. revoluta var. /8. Hornschuchiana Brid. Bry. univ. i, 572 (1826). 



T. revolut i var. /3. Hornschuchiana De Not. in Mem. aec. Torin. xl, 315 (1838). 



Tortula Hornschuchiana De Not. Syllab. 179 (1838), Muse. ital. I, 55, t. 27 (1862), Epil. 

 bri. ital. 552 (1869). WiLS. Bry. brit. 127, t. 43 (1885). Hartm. Skand. fl. 8 ed. 393 

 (1861). Berk. Handb. br. m. 256 (1863). Lindb. de Tort. 248 (1864). Hobk. Syn. 

 br. m. 68 (1873). 



Dioicous ; slender, Jin. high, in lax dull green patches on the 

 ground, stems dichotomous, fastigiate branched. Leaves erecto-patent, 

 when dry incurved and often spirally imbricated, lanceolate, concavo- 

 carinate, almost all the margin subrevolute, obsoletely papillose, 

 mucronate with the excurrent nerve ; cells at base rectangular, in the 



