COSMARIUM. 35 



Length 21 /x ; breadth 14 p, ; breadth of isthmus 10//,; 

 thickness 12//,. 



EXGLAXD. Cautley Spout, W. Yorks ! 



This variety occurred among mosses on wet rocks. It is 

 very probable that the typical form will be found in the more 

 northern ghylls and glens of the British Islands as there are 

 numerous suitable habitats which have not yet been in- 

 vestigated. 



68. Cosmarium Novae-Semlise Wille. 

 (PI. LXVIII, fig. 16.) 



Cosmarium Novse-Semlix Wille, Ferskv. Alg. Nov. Semlj. 1879, p. 46, 1. 13, 

 f . 45 ; Lemaire, Liste Desm. Vosges, 1883, p. 21, t. 1, f . 4 ; De Toni, 

 Syll. Alg. 1889, p. 1012 ; Xordst. Index Desmid. 1896, p. 184. 



Ui-sinella Novx-Semliae Kuntze, Revis. gen. plant. 1891, p. 925. 



Cells very small, about 1J times as long as broad, 

 slightly constricted, sinus widely excavated and shallow, 

 isthmus somewhat elongated ; semicells transversely 

 oblong, apex retuse, sides truncately rounded and 

 furnished with four denticulations, with two oblique 

 series of denticulations (2 in the outer series and 3 in 

 the inner series) within each side, and with a small 

 but conspicuous central wart. Side view of semicell 

 ovate-elliptic with a papilla at the middle of each side. 

 Vertical view broadly elliptic, ratio of axes about 

 1 : 1'5, with about 5 denticulations round the margin 

 of each pole, and a prominent papilla at the middle on 

 each side. Chloroplast axile with a central pyrenoid. 



Zygospore unknown. 



Length 15-20 /^; breadth 12-16 //,; breadth of 

 isthmus 6-8 p.', thickness 11-12 p. 



EXGLAXD.- -Cocket Moss, near G-iggleswick, and in 

 bog two miles south of Clapham, ~\V. Yorks ! 



Geo(i\\ Distribution. France. G-alicia. Xova 

 Zembla. Faeroes. East Africa. 



C. Novx-Semlidz is a very much rarer species than 

 C. Reynesi, from which it is distinguished by its propor- 

 tionately greater length, the more rounded sides of the semi- 

 cells, the arrangement of the denticulations, and by the small 

 peg-like papilla in the centre of each semicell. 



