Hypnace^.] 8r [Hypnum. 



Great confusion exists as to the true H. prelongum of Linnaeus, increased 

 by the fact that the plant so named in his herbarium is represented by Ambl. 

 viparium, yet Lindberg assured me that all the Scandinavian specimens he 

 had seen in the old herbaria were the same as our common British plant, 

 which undoubtedly was that of Linnaeus. This was the view of all British 

 botanists, until Schimper in the Bryologia Europsea, called our moss 

 Eiwhynchium Stokesii, and set up as pralongum what is here named distans, in 

 which he was followed by all continental bryologists. The subject is a 

 difficult one to clear up satisfactorily, as this H. distans had not been distin- 

 guished from our pralongimi, and much as uniformity in nomenclature is 

 desirable, I have in this instance adhered to our old view. 



12. HYPNUJff SWARTZII Turn. 



Dioicous ; stems creeping, not arched, nor bipinnate, with short 

 ascending branches. Leaves uniform, those of stem cordate acute, 

 those of branches cordate or ovate, serrated, nerved above middle. 

 Seta rough, capsule ovate cernuous, lid rostrate. (T. C. A.) 



Syn. — Hypnum repens filicinum, triaHgulariburS parvis foliis Var. brevior Dill. Hist. muse. 279, 

 t. 35, fig. 15B (1741), et Herbar. 



Hypnum pralongum Hedw. Descr. iv., 76, t. 2g {1797) p.p. 



Hypnum atrovirens (non Dicks.) Swartz Muse. suee. 65 (1799). 



Hypnum Swartzii Turn. Muse. hib. 151, t. 14, f. i (1804). Smith F1. Brit. 1293 (1804). 

 Eng. Bot. t. 2034. WiLS. Bry. brit. 349 (1855). Hoek. Synops. 156 (1873). Lindb. 

 Muse, scand. 34 (1879). 



Hypnum pmlongum^. atrovirens Beid. Sp. muse. II, 104 (1812), Bry. univ. ii, 402 

 {1827). BouL. Muse. Fr. 104 (1884). 



H. prmlongum p. p. Hook. Tayl., Huebener, Berkeley, &c. 



H. pralongum ji. scariosum C. Muell. Synops. ii, 447 (1851). 



Eurhynchium pmlongum Var. atrovirens Br. Sch. Bry. eur. fasc. 57 — 61, p. 8, t. 7, y 

 fgg. I, lb, 2 et 3 (1854). SCHIMP. Synops. 560 (i860), 2 ed. 674. Milde Bry. siles. 

 306 (1869). 



Eurhynchium Swartzii Curnow in Raben. Bryoth. n. 593 (1862). Hobk. Synops. 2 ed. 

 205 (1884). LiMPR. in Rabenh. D. kr. fl. Laubm. iii, 200 (1897). 



Eurhynchium atrovirens Klinggr. Topog. Fl. Westpr. log (1880). 



Rhynchostegium prcelongum Var. Swartzii Vent, et Bott. Enum. crit. 7 (1884). 



Dioicous ; in rigid glossy dark green or blackish-green tufts. Stem 

 creeping, often with long stolons, irregularly pinnate, with lew radicles ; 

 branches in two rows, somewhat flattened. Stem-leaves close, erecto- 

 patent, shortly decurrent, cordate-ovate, long-pointed, finely serrate all 

 around the flat margin, nerve strong, ending below the point ; cells at 

 the concave basal angles in a small group, oval and rectangular, 



