POLYTRICHACE^E.] 43 [Oligotrichum. 



OLIGOTRICHUM INCURVUM (Huds.) Lindb. 



Dioicous; stems short, simple. Leaves patent, incurved, lanceo- 

 late, concave, involute above, subserrate, lamellae numerous, undulated. 

 Capsule erect, ovato-cylindric ; lid conic, acuminate. (T. V, D.) 



SYN. Bryum incurvum HUDS. Fl. Angl. 2 ed. 479 (1778). 



Catharlnea hcrcynica EHRH. Beitr. i, 190 (1787). WEB. MOHR Bot. Tasch. 217 (1807). 



Fl. dan. t. 1417 (1810). ROHL. Deutsch. Fl. iii, 61 (1813) ; Ann. Wett. Ges. iii, 232 



(1814). BRID. Mant. muse. 203 (1819) ; Bry. univ. ii, 99 (1827). RABENH. Deutsch. 



Krypt. Fl. ii, P. 3, 234 (1848). C. MUELL. Syn. muse, i, 196 (1849). 

 Polytrichum hercynicum HEDW. St. crypt, i, 40, 1. 15 (1787) ; Sp. muse. 94 (1801). SCHRANK 



Baier. Fl. ii, 447 (1789) ; Prim. Fl. sal. 824 (1792). DICKS. PI. crypt, Fasc. 2, 3 (1790). 



WITH. Bot. arr. Br. Veg. 3 ed. iii, 797 (1796). BRID. muse. rec. ii, P. I, 91, t. 2, f. 12 



(1798) ; Sp. muse. I, 77 (1806). HULL Brit. Fl. P. 2, 248 (1799). ROTH Fl. germ, iii, 



353 (1800). ROHL. Moosg. Deuts. 197 (1800). SMITH Eng. Bot. t, 1219 (1803); Fl. Br. 



iii, 1381 (1804). WAHLENB. Fl. Lap. 348 (1812); Fl. Carp. 349 (1814). SCHWAEGR. 



Suppl. I, P. II, 329 (1816). HOOK. TAY. Muse. Br. 24, t. X (1818). FUNCK Moostasch. 



70, t. 57 (1821). GRAY Nat. arr. Br. PI. i, 720 (1821). HOOK. Fl. Scot. P. 2, 125 (1821) ; 



Brit. Fl. ii, 45 (1833). WALLR. Fl. crypt, germ, i, 195 (1831). HUEBEN. Muse. germ. 



521 (1833)- 



Orthotrichum hercynicum HOFFM. Deutsch. Fl. ii, 25 (1795). 

 Atrichum hercynicum P. BEAUV. Prodr. 42 (1805). 

 Oligotrichum hercynicum LAM. ET DE C. Fl. franc. 3 ed. ii, 492 (1805). BR. SCHIMP. Bry. 



eur. iv, mon. 4, t. 5 (1844) ; Syn. muse. eur. 436 (1860), et 2 ed. 531 (1876). WILS. 



Bry. Brit. 205, t. x (1855). BERK. Handb. Br. m. 212, t. 19, f. 3 (1863). MILDE Bry. 



Sil. 247 (1869). DE NOT. Epil. Briol. Ital. 342 (1869). HOBK. Syn. br. m. 101 (1873). 

 Olig. incurvum LINDB. in HARTM. Skand. Fl. 9 ed. ii, 45 (1864), et in Not. ur Sallsk. Fn. 



et Fl. fenn. forh ix, 144 (1867). 



Dioicous ; gregariously caespitose, in loose tufts, adhering by the 

 earth at roots, pale glaucous green, when old rufescent. Stems about 

 i in. high, erect, simple, rigid. Lower leaves remote, minute, appressed, 

 oval, acuminate ; upper crowded, rigid, twisted when dry, patent when 

 moist, subarcuate-incurved, very concave, from a pale thin, sheathing 

 base, narrowly lanceolate, the margin inflexed above the middle, remotely 

 serrate in upper part ; nerve at back toward apex, with three narrow 

 remotely serrate lamellae, above with 10 12 high, sinuose, strongly 

 undulated lamellae, each in section of 5 12 equal rounded cells. 

 Capsule on a thickish orange-red pedicel, twisted to the right above 

 when dry, ovato-cylindric, erect, ferruginous, when dry plicate, contracted 

 below the mouth, and with a few stomata on the neck ; lid large, convex- 

 conic, obtusely acuminate, fugacious ; teeth of peristome pale, short, 

 unequal ; spores very small, smooth. 



Male plants short, more slender, the infl. rosaceous, bracts broadly 

 oval, acute, with a lamellar nerve; paraphyses both filiform and 

 spathulate. 



HAB. Bare declivities and sandy ground on mountains. Scotland, Wales, 

 N. of England, Ireland. Fr. 7. 



Var. (3. Laxum Braithw. 



Stems 34 in. high, slender, flexuose. Leaves more distant and 



