HYPNACE^;.] 119 [Lesquereuxia 



CLAVIS TO THE SPECIES. 



Leaves spreading on all sides. 



Leaves erecto-patent, acuminate, cells smooth. plicata. 



horizontally patent, short-pointed, cells papillose. atrovirens. 



secund, oblique at points. 



Plants trailing, branches straight, leaf-cells oval. filamcntosa. 



slender, closely adherent, branches arcuate, leaf-cells narrow, 



linear. saxicola. 



i. LESaUEREUXIA PLICATA (Schleich.) Lindb. 



Dioicous ; in spreading yellow-green tufts, irregularly pinnate. 

 Leaves crowded, ovato-lanceolate, acuminate, deeply plaited, margin 

 reflexed, entire, nerved nearly to apex ; cells smooth ; paraphyllia 

 numerous. Capsule ovate-oblong, cernuous. (T. CVII, C.) 



SvN.Hypiuim plicatiim SCHLEICHER Cent. IV, n. 27 et Catal. 1815. WEB. MOHR Bot. Tasch. 

 364 (1807). BRID. Sp. muse. II, 229 (1812), Mant. 180 (1819). SCHWAEG. Suppl. I, P. 

 II, 301 (1816). HUEBEN. Muse. germ. 682 (1833). DE NOT. Syllab. 51 (1838). 

 RABENH. D. kr. fl. II, S. 3, 295 (1848). C. MUELL. Synops. ii, 363 (1851). WILS. Bry. 

 Brit. 339 (1855). HOBK. Synops. 147 (1873). BOULAY Muse. Fr. 136 (1884). 



Hypnum Stcreodon plicatus BRID. Bry. univ. ii, 636 (1827). 



Brachythcc turn plicatiim BR. SCH. Bry. Eur. fasc. 5254, p. 21, t. 21 (1853). MILDE Bry. 

 Siles. 338 (1869). DE NOT. Epilogo 113 (1869). Dix. JAMES. Stud. Handb. 399 (1896). 



Ptychodium plicatiim SCHIMP. Synops. 527 (1860), 2 ed. 638. BERK. Handb. 133 (1863). 

 HOBK. Synops. 2 ed. 197 (1884). HUSN. Muse. gall. 320, t. 92 (1893). LIMPR. in 

 RABENH. D. kr. fl. Laubm. ii, 802 (1895). 



Lesqiiercuxia plicata LINDB. Muse, scand. 36 (1879). 

 Ptychodium erectum CULM, in Rev. bryol. 1884, P- 8 9- 



Dioicous ; in trailing dark green tufts, rather glossy, dark brown at 

 base, stems with thick distant curved branches, with short ramuli and 

 numerous multiform paraphyllia. Leaves ovate, much acuminate, erecto- 

 patent when moist, imbricated when dry, yellowish-green, subsecund, 

 nerved nearly to apex ; cells smooth, yellow and incrassate at base, long 

 and hexagonal above, quadrate at angles. Perichaetial bracts erect, 

 sheathing, pale, nerved above half-way. Seta purple, smooth, capsule 

 cernuous, oblong, dull brown, lid short conical; teeth of peristome orange, 

 lineal-subulate. Male infl. ovate with pointed nerveless bracts. 



HAB. Crevices of alpine rocks. Summit of Ben Lawers, sterile. (Lyon 

 1841). 



This is the only British locality for this moss which is most at home on 

 limestone, in the Alps and Jura mountains. It is to be feared the rapacity of 

 collectors will soon exterminate it here, as the rock on which it grows is well 

 known. It is easily known by the many longitudinal plaits on the leaves. 



