HypNACE^.l 152 [Ptilium. 



Dioicous ; in wide-spreading, bright green or yellowish tufts, vaguel}- 

 pinnate, not glossy, continued as prostrate rooting stolons. Branches 

 arched, subfasciculate, \\-ith few ramuli, and unequal in length; para- 

 phyllia small, lanceolate. Stem-leaves crowded, divergent, from a broad 

 decurrent base, deltoid-cordate, suddenly prolonged into a lanceolate- 

 subulate, recurved point, concave, feebly striate, sharply serrate all round, 

 nerve ver}- short and double or sometimes reaching above middle, cells 

 narrow and linear, at angles hyaline, small, oval and hexagono-rectangular- 

 Branch-leaves divergent, ovato-lanceolate. Perich. bracts pale, erect, 

 lanceolate with a long flexuose subula, seta red, rough with tubercles, 

 capsule cernuous, ovate-oblong, gibbous, peristome yellow, inserted 

 below the mouth, processes fenestrate, cilia two, appendiculate. 



Hab.— By waterfalls and on stones in streams. Not common. Fr. 10 — 11. 



Aber and Bangor, N. Wales c. fr. {Wilson) ! ! Beddgelert and Arthog c. fr. (Hunt 1865) ! ! 

 Rivington Pike, Bolton c. fr. Lydford cascade c. fr. {Holmes 1867) ! ! Cromaglown, 

 Killarneyc.fr. (^ViVmh 1829) ! Rowardennan glen, Loch Lomon d (K'irfs/oH) ! ! Glen 

 Lochay {Cocks igoo) ! ! with two long nerves. Near Loch Scatavagh, N. Uist, a very 

 slender form (Braithwaite i8gg) ! ! 



This moss is rare on the continent, and resembles a Brachythecium, but is 

 easily distinguished by the different ner^^es, the fruit is rare. 



18. PTILIUM {Sulliv.) De Not. 



Muse. & Hep. U.S. 73 (1856). 



Tall laxly tufted mosses with simple or dichotomous stems coated 

 with numerous paraphyllia, distichously pinnate, the branches of equal 

 length, horizontally divergent. Stem-leaves from a broad ovate base, 

 gradually lanceolate-subulate, strongly multiplicate, nerves two very short 

 or none, cells very narrow and linear. Capsule cylindric, arcuate. — 

 Der. nriXoi' feathers. 



PTILIUM CRISTA-CASTRENSIS (L.) De Not. 



The only species. (T. CXII, F.) 



Syn. — Hypnum crista-castrensis L. Sp. pi. 1125 (1753), Syst. naturae ii, 703 (1791). Swartz 

 Muse. suae. 65 (i7g9). Hedw. Sp. muse. 287, t. 76, f. i — 4 (1801). Web. Mohr Bot. 

 Tasch. 368 (1807). Wahlenb. F1. Lapp. 377 {1812), Fl. Carpat. 361 (1814). Brid. 

 Sp. muse. II, 207 {1812), Mant. 177 (1819), Bry. univ. ii, 517 (1827). Hook. Tayl. 

 Muse. Brit. 114 (1818). Schwaeg. Suppl. I, P. II, 293 (1816). Hook. Fl. Scot. P. 2, 

 148 (1821). HuEBEN. Muse. Germ. 685 (1833). De Not. Syllab. 54 (1838). Rabenh. 

 D. kr. fl. II, S. 3, 276 (1848). C. Muell. Synops. 296 (1851). Wils. Bry. Brit. 395 

 (1855I. Br. Sch. Bry. Eur. fasc. 57 — 61, p. 30, t. ig (1854). Berk. Handb. 123, t. 11 

 (1863). MiLDE Bry. Siles. 366 (i86g). Hobk. Sjmops. 156 (1873). HusN. Muse. Gall. 

 409, t. 118 (1894). Dix. James. Stud. Handb. 479 (1896). 



Hypnum scalare Zenk. Dietr. Muse, Tbuiing. exsic. no. 26 (1823). 



