DicRANACE^.] 98 [Ditrichum. 



2. DITRICHU3iI TORTILE (Schrad.) Hampe. 



Dioicous ; laxly csespitose ; leaves patent or subsecund, lanceolate- 

 subulate, serrate at point, recurved at margin. Capsule erect, sub- 

 c}'lindric, lid shortly rostellate. (T. XIV, F.) 



Syn. — Trichostomum tortile Schrad. Samml. Kr. Gew, n. 49 (1797) • Usteri Neue Bot. Ann. 

 Fasc. XX. 108 (1799). Brid. Sp. muse. I, 231 (1806) ; Mant. 82 (1819) ; Bry. univ. i, 488 

 (1826). ScHWAEGR. Suppl. I, P. I, 139, t. 35 {1811). ScHULTz Suppl. Fl. Starg. 70 

 (1819). FuNCK Moostasch. 25, t. 16 (1821). Hueben. Muse. Germ. 300 (1833). Br. 

 ScH. Bry. eur. fasc. 18-20, p. 14, t. 10 (1846). Rabenh. Deutsch. Kr. Fl. ii, P. 3, ii5 

 (1848). WiLS. Bry. brit. 115, t. 41 (1855). HusN. Mouss. nord-ouest 71 (1873). Hobk. 

 Syn. Br. m. 62 (1873). 

 Dicranum tortile Brid. Muse. rec. ii, P. I, 129 (1798). Web. Mohr Bot. Tasch. 198, t. 7, 

 fig. 12-13 (1807). VoiT Muse, herbip. 47 (1812). Roehl. Deutsch. Fl. iii, 70 (1813). 



Mnium tortile Gmel. Syst. nat. ii, 1328 (1791). 



Didymodon tortilis W.-Arn. Disp. meth. 37 (1825). De Not. Syllab. muse. n. 367 (1838). 



Leptotrichum tortile Hampe Linnaea 1847, p. 74. C. Muell. Syn. i, 454 (1849). Schimp. 

 Syn. 143 {i860) et 2 ed. 13Q {1876). Berk. Handb. Br. m. 262 (1863). Milde Bry. 

 Siles. 136 {1869). De Not^ Epil. Briol. ital. 516 {1869). 



Dioicous ; dwarf, laxly csespitose, pale glossy green ; stem simple or 

 little divided. Leaves subsecund or patent, curved, lanceolate-subulate, 

 margin thickened, reflexed to the middle, serrate at apex, nerve subex- 

 current ; perich. bracts similar, but longer and sheathing ; cells at base 

 linear, elongated, above small and rounded. Seta subflexuose, slender, 

 rufous, twisting to the left. Capsule erect, narrowly cylindraceous, 

 regular or slightly curved, leptodermous, pale brown ; annulus broad, 

 revoluble ; lid ^ length of caps, red, conic, shortly rostellate ; teeth of 

 peristome on a broadish basal membrane, erect, slightly incurved when 

 dry, red, the legs free or united here and there, papillose. 



Male plants short, slender, infl. terminal ; bracts 6 — 9, ovate, 

 concave, subulate, nerved. 

 Hab. — Sandy banks, and old stone quarries ; rare. Fr. 10 — 12. 



Castle Howard (Spruce 1844) ! ! Rusthall common, Tunbridge Wells (Borrer 1846) ! 

 Hurstpierpoint (Mitten 1846) 1 Sea shore near Whitby (Ibbotson) ! ! 



Var. p. pusillum (Hedw.) 



Stems shorter, more densely crowded. Leaves shorter, nearly straight. 

 Capsule oval or oblong, peristome shorter. 



Syn. — Trichostomum pusillum Hedw. Muse, frond, i, 74 t. 28, f. 2, 4, 9, 10 (1787). Roth. Fl. 

 germ, i, 469. Sm. Fl. Brit, iii, 1237. Eng. Bot. t. 2380. Hartm. Sk. Fl. 5 ed. 385. 

 Hueben. Muse. germ. 298. Fl. Dan. Suppl. t. 45, f. 2. 



Ditrichum pusillum Timm Fl. megap. 11. 777 (1788). 



Bryum pusillum Gmel. Syst. nat. ii, 1333 (1791). 



Bry urn didymodon Hoffm. Deutsch. Fl. ii, 43 (1796). 



Didymodon pusillus Brid. Muse. rec. ii, P. I, 115, t. ■/,, f. 4 (1798), Sp. muse. I, 159 ; Mant. 

 loi ; Bry. univ. i, 509. Swartz Muse. suec. 29. Hedw. Sp. muse. 104. Roehl. 

 Moosg. D. 242 ; Deutsch. Fl. iii, 56. P. Beauv. Prodr. 56. Web. Mohr Bot. Tasch. 

 157. ScHULTz Fl. Starg. 288. Schkuhr Deutsch. Kr. Gew. P. 2, 67, t. 30. Schwaegr. 

 Suppl. I, P. I, 176. Wahlenb. Fl. lapp. 316; Fl. carp. 337. Hook. Br. Fl. ii, 31. 

 Mack. Fl. hib. P. 2, ig. 



