BRYACE.E.] 192 [Bryum. 



Barnard Castle (Spruce 1843). Hill cliff quarry (Wilson i860) ! ! Thirsk (Nowell 1854) ! 

 Slate rocks at Bangor (Hunt 1854) ! ! Rossit and Gresford (Hunt i860) ! Greta bridge 

 (Borrer). Mucruss, Killarney (Hunt 1867) ! ! Dailly, Ayr (Shaw 1865). Shaugh- 

 bridge, Devon (Holmes) ! ! Levens (Barnes) ! ! Luxulyan, Cornwall (Holmes 1884). 



Like all mosses of wide distribution B. capillare varies much both in the 

 fruit and leaves, and after examining a large number of specimens of 

 B. obconicum, I feel constrained to rank it among the varieties, as none of its 

 characters appear to me weighty enough to be of specific value. Non- 

 twisted leaves occur in several forms of B. capillare, and the capsular neck 

 varies considerably in length, as does also the acumination of the leaf point, 

 but the cell-structure of the leaves is identical. Of course if we are to adopt 

 the modern idea of subspecies, as well as varieties, then obconicum must rank 

 among the former. 



34. BRYUM DONII Grev. 



Dioicous ; resembling B. capillare. Leaves spreading, slightly 

 crisped when dry, ovate-oblong, subserrate at apex, with a narrow 

 thickened border, nerve scarcely excurrent. Caps, conico-clavate. 

 (T.LXXV,A.) 



Syn. — Bryum corsicum Walk. Arn. MSS. 



Bryum capillare S. corsicum Brid. Bry. univ. i, 849 (1827), 



Bryum Donianum Grev. in Trans. Linn. Soc. xv, 345, t. 3, f. 6 (1828). WiLS. Bry. 

 br. 241, t. 49 (1855). ScHiMP. Synop. 373 (i860), 2 ed. 454. Berk. Handb. br. ra. 196 

 (1863). De Not. Epil. 391 (i86g). Hobk. Syn. br. m. 117 (1873). Juratz. Laubm. 

 oester.-ung. 285 (1882). BouL. Muse, de Fr. I, 265 (1884). HusN. Muse. gall. 239, 

 t. 64 (1889), LiMPR. in Raben, kr. fl, Laubm. ii, 378 (1893). 



Bryum insulare De Not. Spicil. 7 (1837), et Syllab. 128 (1838). 



Bryum platyloma (non Schwaeg.) Br. Sch. Bry eur. fasc. 6 — 9, p. 58, t. 26 (1839). 

 C. MuELL. Synops. i, 282 (1849). 



Bryum Muelleri Spruce Muse. Pyr. 138, et Ann. mag. nat. hist. 1849. 



Dioicous ; resembling B. capillare, but shorter and in smaller tufts. 

 Upper leaves crowded in a coma, erecto-patent, somewhat twisted 

 when dry, subpathulate-oblong and elongate, limb yellowish, narrow 

 and incrassate of 2 — 3 strata of narrow pachydermous cells confluent 

 with the apical mucro, distantly serrate at point ; nerve strong, 

 excurrent in a solid fuscous point ; cells denser, more solid. Caps, 

 inclined, rather large, oblongo-obconic, rufous-brown, lid mamillar, 

 castaneous, very glossy. Male infl. gemmiform, in the coma. 



Hab. — Gravelly banks and rocks ; not common. Fr. 5 — 6. 



Near Winchelsea, Sussex (jfenner 1844) ! Winwick stone quarry near Warrington and 

 Conway (Wilson). Damp sand-bank near Hurstpierpoint (Mitten). Penzance (Curnow 

 1869) ! 1 Lancing and Betehworth (Davies 1857) ' ' Dadnor, near Ross (Rev. A. Ley 

 1890) ! Torquay and Anglesey. 



