BRITISH DESMIDIE^. 21/ 



53. S. ? minus (Kiitz.) ; frond smooth ; end view with tive slender 



acute rays. 



Pentasterias minor, Kiitzing, Phycologia Generalis, p. 162 (1843). 

 Phycastrumi minus, Kiitziug, Phycologia Gennanica, p. 139 (1845) ; in lit. 

 cum icone. 



Nordhausen, Prussia, Kiitzing. 



Tab. XXXV. fig. 18. a, h. Fronds : from drawings by Professor Kiitzing. 



54. /S. glabrmn (Ehr.) ; frond smooth ; end view^ triangular, each 

 angle terminated by a mucro-like spine. 



Euastrum, No. 14, Bailey, Amer. Journ. of Science and Arts, v. 41. p. 297. 



t. 1. f. 14 (1841). 

 Desmidium glabrmn, Ehrenberg, Verbreitung und Einfluss des Mikrosk.Lebens 



in Sad- und Nord-Amerika (1843) ; Meteorp. t. 1. f. 3. 

 Phycastrum glabrmn, Kiitzing, Phycologia Germanica, p. 137 (1845). 



West Point, New York, Bailey. Geraiany, Ehrenberg . 

 This species is probably identical with Staurastrum Avicula. 



55. S. gj'anulosum (EAhr.). 



Desmidium granulosum, Ehrenberg, Meteorp. t. 1. f. 12. 



Phycastrum gramdosmn, Kiitziug, Phycologia Germanica, p. 138 (1845). 



Germany, Ehrenberg . 



This species is known to me only by name. 



56. Si. globulatum (Breb.) ; segments fusiform, capitate ; end view 



lar, each angle terminated by a granulated knob. 



Staurastrum globulatum, BreTiisson, in lit. cum icone (1846). 



Falaise, Brebisson. 



Tab. XXXV. fig. 23. a. end view of frond ; b. front view : from drawings 

 by M. de Brebisson. 



DOCIDIUM, Breb. 



8. D. coronatum (Breb.) ; frond stout ; suture projecting on each side ; 

 segments inflated at the base and bordered by tubercles at the end. 



Docidium coronatum, Brebisson, in lit. cum icone (1846). 



Falaise, Brebisson. 



This species agrees with Docidimn nodulosmn not only in size and form, 

 but in ha^-ing a suture projecting on each side, and also in its segments, which 

 have undulated margins ; but it is distinguished from that plant by having 

 the ends bordered with minute but distinct tubercles. The end view is cir- 

 cular, the margin crenate. Docidium coronatum differs from D. Ehrenbergii 

 in its larger size and projecting suture. 



