HypNACEiE.] 127 [Pierogoninm. 



PTEROQONIUM ORNITHOPODIOIDES {Huds.) Lwdb. 



Dioicous ; secondary stems ascending with fasciculate arcuate 

 branches. Leaves crowded, imbricated, concave, ovate, serrated above, 

 faintly two-nerved at base. Capsule oblong, lid conic, apiculate. 

 (T. CVIII, C.) 



Syn. — Hypnum gracile ornithopodioidcs Dill. Hist. muse. 320, t. 41, f. 55 (1741). 



Hypmim ornithopodioides HuDS. Fl. angl. 430 (1762). 



Hypnum gracile L. Mantissa ii, 310 (1771) et Herb. Roth Fl. germ, i, 471 (1788). 



Pterigynandrum gracile Hedw. Muse. fr. iv, 16, t. 6 (1793), Sp. muse. 80 (1801). Brid. 

 Muse. rec. H, P. I, 62 {1798), Sp. muse. H, 129 (1806), Mant. 126 (1819), Bry. univ. ii, 

 174 (1827). RoEHL. Moosg. Deut. 127 (1800), Deutscli. Fl. iii, 53 (1813). P. Beauv. 

 Prodr. 86 (1805). 



Maschalanthus gracilis Spreng. in Sehvad. Journ. Bot. ii, 467 (1799). 



Picrogonium gracile Swartz Muse. suee. 26 (1799). Smith Fl. Brit. 1271 (1804), Eng. 

 Bot. t. 1085. ScHwAEG. Suppl. I. P. I, 105 (1811). W^AHLEN. Fl. earp. 338 (1814). 

 Hook. Tayl. Muse. Brit. 41, t. 14 (1818). Hook. Fl. seot. P. II, I2g (1821), Br. fl. ii, 

 69 {1833). FuNCK Moost. 19, t. 13 (1821). Gray Nat. arr. Br. pi. i, 728 (1821). Br. 

 ScH. Bry. F.ur. fase. 46 — 47, p. 4, t. 2 (1851). WiLS. Bry. Brit. 321, t. 14 (1855). 

 ScHiMP. Synops. 500 (i860), 2 ed. 575. Berk. Handb. 152 (1863), Milde Bry. siles. 

 272 (1869). De Not. Epilogo 211 (1869). Hobk. Synops. 142 (1873). Lesq. James 

 Moss. N. Amer. 290 (1884). Dix. James. Stud. Handb. 367 (1896). Limpr. in Kabcnh. 

 D. kr. fl. Laubm. ii, 780, fig. 345 (1895). 



Grimmia ornithopodioidcs Web. Mohr Bot. Tasch. 148 (1807). 



Leptohytnenitim gracile Hueeen. Muse. germ. 554 (1833). I)e Not. Syllab. 80 (1838). 

 Rabenh. D. kr. fl. II, S. 3, 249 (1848). 



Neckera gracilis C. Muell. Synops. ii, 97 (1850). 



Leptohymenium duplicato-sirratum Hampe in Linnsea xxx, 460. 



Pterogonium ornithopodioides Lindb. in Oefver. Vet. Akad. foerhandl. xx, 411 (1863). 

 HuSN. Muse. gall. 294, t. 83 (1892). 



Isotheciiim ornHhopodioidcs Boulay Muse. Fr. 145 (1884). 



Dioicous ; in rather rigid, lax yellowish-brown glossy tufts ; main 

 stem growing from a creeping rhizome, with descending stolons near the 

 base, secondary shoots ascending, dendroid, with fasciculate incurved 

 branches above. Basal leaves appressed, lanceolate, entire, nerveless ; 

 upper erect and imbricated when dry, spreading when moist ; decurrent, 

 ovate, acute, concave, margin flat, incurved below, serrate toward apex, 

 nerve short, double or forked ; cells flat, rhombic above, elongated at 

 mid-base, transversely rhomboidal towards margin. Perich. bracts 

 lanceolate acute nerveless, seta purple ; capsule erect, cylindric small at 

 mouth, castaneous ; calyptra cucullate with a few fine hairs at back, lid 

 small conic ; teeth of peristome lanceolate, yellowish, endostome a low 

 membrane with short subulate processes and no cilia. 



Hab. — On rocks and trunks of trees. Fr. 11 — 12. 



Beddgelert (Hunt 1865) ! I Lyndhurst (Syme 1858). Rydal (Dr. Wood 1864) ! I 



