COSMARIUM. 261 



mountainous districts of the west coasts of the British Islands, 



and so far as our present scanty knowledge goes, the " forma 

 gramdata " would appear to be more frequently observed than 

 the type. The zygospores were observed among various 

 Jungermanniaceae on dripping limestone rocks. 



Var. asperum nob. (PI. XC, fig. 13.) 



Cosmarium aspemm West & Of. S. West, Xew Brit. Freshw. Alg. 189-4, 

 p. 8, t. 1, f. 21 ; Xordst. Index Desm. 1896, p. 53. 



Cells proportionately a little narrower, margin 

 of semicell with 10 triracate-emarffinate crenations, 



o 7 



granules within the margin more or less irregularly 

 disposed, apex slighfclwemarginate in the middle ; 

 with a double row of o/anule-like warts across the base 

 of the semicell. 



Length 45 /x ; breiidth ol/t; breadth of isthmus 

 12'5ju; thickness lo'o ILL 



SCOTLAND. Xear New Galloway, Kirkcudbright ! 



217. Cosmarium eductum Roy & Biss. 

 (PL XC, figs. 14, 15.) 



Cosmarium eductum Roy it Biss. in Xordst. Desm. Bornh. 1888, p. 198, 

 t. 6, f. 8 ; De Toni, Syll. Alg-. 1N89, p. 952 ; Eoy & Biss. Scott. Desm. 

 1894, p. 100, t. 1, f. 9 ; Schmidle, Lappmark Siisswasseralg-en, 1898, 

 p. 24, t, 1, f. 21. 



Ursinella educta Kuntze, Revis. gen. plant. 1891, p. 924. 



Cells rather small, subhexagonal in general outline, 

 about 1-g- times as long as broad, somewhat deeply 



constricted, sinus narrowly linear, very slightly dilated 



ii ii fj 



at the extremity; semicells trapeziform, base some- 

 what subreniform, basal angles rounded, lower parts of 

 sides strongly rounded-inflated and indistinctly 34- 

 undulate, upper third of sides substraight, apex pro- 

 duced, truncate or scarcely convex, apical angles 

 scarcely rounded ; within the margins sparsely and 

 very delicately granulate (or undulate -granulate), 

 smooth in the centre. Side view of semicell ovate- 

 circular. Vertical view broadly elliptic, margins 

 faintly undulate (more especially towards the poles). 



