BRITISH UESMIDIE^. 217 



53. S.} tninus (Kiitz.) ; frond smooth; end view with five slender 



acute rays. 



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

 Phycastrumi minus, Kiitzing, Phycologia Gennanico, p. 139 (1845) ; in lit. 

 cum icone. 



Nordhauseu, Prussia, Kiitzing. 



Tab. XXXY. fig. 18. a, b. Fronds : from drawings by Professor Kiitzing. 



54. S. glabrum (Ehr.) ; frond smooth ; end view triangular, each 

 angle terminated by a mucro-like spine. 



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



t. l.f. 14 (1841). 

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



in Slid- und Nord-Amerika (1843) ; Meteor]^, t. l.f. 3. 

 Phy cast rum glabrum, Kiitzing, Phycologia Germanica, p. 137 (1845). 



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

 This species is probably identical with Staurastrum Avicula. 



55. S. granulosum {FAiY.). 



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



Phycastrum gramdosum, Kiitzing, Phycologia Germanica, p. 138 (1845). 



Germany, Ehrenberg . 



This species is known to me only by name. 



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



lar, each angle terminated by a granulated knob. 



Staurastrum globulatum, Brebisson, 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, BrebissoQ, in lit. cum icone (1846). 



Falaise, Brebisson. 



This species agrees with Docidium nodulosum not only in size and form, 

 but in having 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 Avith 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. 



