447 



320-390 V..; breadth, 32 <j..; do., at apex, 8-10 7.. Vielleicht ist dies 

 eine eigeiie Art. 



Verf. weist nach, dass Closterium striolaluin Rali's wahrschein- 

 licli inehrere Arten umfasst. 



Cosmarium Tv.rneri Roj 1. e. p. 337. 



= C. margariliferwn Ralfs Brit. Desm. f. XXXllI, fìg. 6 b. 

 Length, 46,5-48 a.; breadth, 88-39 a.; do. isthraus, 12-13 a.; thi- 

 ckness, 25,5 a.,- dianieter of zygospore, 44-45 a.; length of spines 

 of do., 8 :].. 



Ausserdetu beschreibt Verf. dio Zygote von Sphcerozosma gra- 

 nulaium Roy et Biss. (cubica!, smooth with one or two short stout 

 blunt spines at each augia. Length and broadt, 14,5 y.. ; length of 

 spine, 3,5 u..) uml von Staurastrum glabrum Ehrenb die Zelle und 

 die Zygote (dianieter of globular zygospore 25,6 a., without spines; 

 length of spines 14,4 a. Spines numerous, siniple, subulate, base 

 broad). 



16. In dieser Arbeit werden folgende nene Arten (ohiie Abbil- 

 dungen) beschrieben. 



Closterium Pseudodiance Roy 1 e. p. 201. 



A sraall slender species, about 15 times longer than broad, re- 

 gularly, but not strongly curved; inner margin almost straight for 

 about Vs of its length; frond smooth, without strijB, brownish straw- 

 coloar, with one suture, tips slightly thickened; fìllets irregular; 

 about one-tenth of semi-cell towards the apex without chloi'ophyl, 

 and containing a few raoving granules. Length, 210 y..; breadth, 14 

 [x. ; do. at apex, 3 u.. 



Aehnelt sehr C. Diancv; nicht selten in Schottland und Irland. 



Costnarium gradalum Roy 1. e. p. 203. 



Medium sized, one-fifth longer than broad; ends truncate incli- 

 ning to concave; base sligthly reniform; constriction deep, segnients 

 dose lower and upper angles acutely rounded, sides curved with 

 6-7 undulations rather than granules which are largei- upwards; 

 surface gramilated in regular radiating doublé rows from the mar- 

 ginai undulations half way to the centro, where there is a large 

 granulated prominence; ends slightly wavy ; side view of semi-cell 

 globular; end view elliptical, with large granulated protuberance on 

 each side. Length, 42 y..; breadth, 35 y.; isthraus, 12 y. 



Vielleicht welter nichts ala C. formosuhim Hoff in Nordst. ; sehr 

 verbreitet in Schottland ui)d Irland. 



C, Slewdrumense Roy 1. e. p. 204, 



