Hypnace.e., no [Hypnum. 



Wallasey, Soutbport {Hunt 1864) ! ! Treveylor Wood, Penzance (Ctirnow 1869) ! ! On 

 thatch near Edinburgh (Dr. B. White 1867) I ! 



Var. €. densiun Schimp. 



Stems creeping, flagelliform, pinnate with close branches, leaves crowded, 

 laxly imbricated, dark green ; seta short. 



Syn. — Bry. eur. t. 10, j. Limpr. p. 109. 



Hab. — On rotten wood. 



Var. t,. robustum Schimp. 



Stem depressed, with stout erect branches ; leaves crowded, laxly 

 imbricated, broad and concave, deep green ; seta short. 



Syn.— Bry. eur. t. 10, t,. Limpr. p. lOg. 



Hab. — Wet places in woods and by streams. 



By river Foss, York (Ingham 1898) ! ! Cadley, Preston (H. Beesley 1900) ! ! 



H. rutahulum varies very much according to environment, especially in the 

 leaf-point and amount of serration. Several other forms occur almost as 

 worthy to be varieties as these given above. There is no doubt it is 

 sometimes dioicous, or polygamous, and then scarcely separable from the next 

 species. 



37. HYPNUM RIVULAIIE Bruch. 



Dioicous ; in lax rather rigid tufts. Stems elongated, arched or 

 subpinnate, with scattered slender incurved branches. Stem-leaves 

 spreading, deltoid-ovate, concave, plicate, finelj- serrated, nerved above 

 half-way. Seta verj- rough; capsule roundish-o^•ate, cernuous, lid conical, 

 pointed. (T. CVI, A.) 



Syn. — Hypnum chrysostomnin (non Richard) C. Muell. Synops. ii, 368 (1851). 



Hypnum rivulare Bruch in sched. WiLS. Bry. brit. 346 (1855). Berk. Handb.8i (1863). 

 BouLAY Muse. Fr. 122 (1884). 



Brachythechim rivulare Br. Sch. Bry. Eur. fasc. 52 — 54, p. 13, t. 12 (1853). Schimp. 

 Synops. 543 (i860), 2 ed. 655. Milde Bry. Siles. 338 (1869). De Not. Epilogo no 

 (i86g). HoBK. Synops. 2 ed. 200 (1884). Husn. Muse. gall. 322, t. 92 (1892). Dix. 

 James. Stud. Handb. 403 {1896). Limpr. in Rabenh. D. kr. fl. Laubm. iii, 128 (1896). 



Dioicous ; in large bright green rigid tufts. Stems creeping, naked 

 at base, arched, with scattered attenuated branches, or subdendroid with 

 shorter fascicled branches. Stem-leaves patent, more decurrent, deltoid- 

 ovate, suddenly short-pointed, concave, plicate, finely serrate at margin, 

 excavate at angles, nerved above middle; cells longish at base, the 

 angular elongated rectangular hyaline ; branch -leaves lanceolate, gradually 



