BUITISII DESMTDIE.E. 127 



Goniocystis {Trigonunjstis) miiricafa ft, Hassall, Brit. Freshwater JIgcp, 

 p. 351 (1845). 



Sussex, Mr. Jenner. Dolgelley, J. R. 



Falaise, Brebisson. Germany, Ehrenberg, Corda, Kiitzmg. 



Frond deeply constricted at the middle, nearly equal in length and breadth, 

 rough with minute conic granules or spines. End view triangular, its sides 

 convex and angles broadly rounded. 



Staurastnim muricatiim. is larger than S. hirsiitum, and not hirsute, but 

 rough with stout short granules or spines ; in the end view also the sides are 

 more convex. 



Length of frond ^^ of an inch ; breadth -^\^. 



Tab. XXII. fig. 2. a. front view; b. end view. 



11. (S^. hirsutum (Ehr.) ; segments semiorbicular, rough with nu- 

 merous hair-like spines ; end view with three rounded angles and 

 straight or slightly convex sides. 



Xanthidium hirsutum, Ehrenberg, Abh. der Berl. Ak. 1833, p. 318 ; Infus. 

 p. 147. t. 10. f. 22. Meneghini, Synop. Desmid. inLinncea 1840, p. 224. 



Binatella kispida, Brebisson, Afg. Fal. p. 58. t. 8 (1835). 



Xanthidium pilosum, Ehr. Bericht der Berl. Ak. 183G (according to Mene- 

 ghini) . 



Staurasfrum muricafum, Ralfs, Annals of Nat. Hist. v. 15. p. 154. t. 1 1, f. 1. 

 a, b, c (1845) ; Trans, of Bot. Soc. of Edinburgh, v. 2. p. 141. t. 14. 

 Jenner, FI. of Tunhridge Wells, p. 194. 



Euastrum (^Xanthidium) hirsutum, Kiitzing, Phycologia Germanica, p. 137 

 (1845). 



Goniocystis (Trigonocystis) muricata, Hassall, 5/v7. Freshv)ater Algce, p. 351 

 (1845). 



Staurastrum hirsutum, Brebisson, in lit. cum icone (1846). 



Dolgelley and Penzance, J. R. Sussex, Mr. Jenner. Ambleside, Mr. 

 Sidebotham. Rochdale, Mr. Coates. Yate, Mr. Broome. Aberdeenshire, 

 Mr. P. Grant. 



Germany, Ehrenberg, Kiitzing. Falaise, Brebisson. 



Frond variable in size, about equal in length and breadth, deeply constricted 

 at the middle ; segments semiorbicular, hirsute rather than spinous ; hairs 

 numerous, scattered. End view triangular ; the sides straight or shghtly con- 

 vex, and the angles broadly rounded. 



I have gathered sporangia at Dolgelley and Penzance. They are orbicular, 

 their spines short, and branched at the apex. 



The hair-like spines are characteristic of this species. 



Length of frond from ^-i^ to ^^ of an inch ; breadth from g-i^ to ^^ ; 

 breadth at constriction ^3^^^ ; diameter of sporangium from yj^ to -^\^ ; length 

 of spine of sporangium -g-oW . 



Tab. XXII. fig. 3. a. front view of frond with endochrome ; b. front view 

 of empty frond ; c. end view of frond with endochrome ; d. end view of empty 

 frond; e. transverse view; /. immature sporangium ; g, h. mature sporangia. 



