6o 



jugating fronds closely adhering crossed as in C. Lcibleinii, etc. 



Diam. 38-45 -j.. _i 



Die Zvgote dieser Art ist frùher beschriebcn. 



C. juncidum Ralfs a Ralfs: Diam. of smooth, g!obular, brownish 

 zygosp., 22 y, [j.. — fj Ralfs: diam. of globular, thick-walled, yellowish 

 zygosp. 40-44 a. 



C. Linea Perty. The zygosp. is subquadrate, longer than broad, 

 sides and ends a little concave, angles drawn out into acute proces- 

 ses, strongly resembling the zygosp. of the form of C. acutum 

 Ralfs T. XXXIV, f. 5. Length of zygosp., without processes, 19-22 '/, a..; 

 with process., 32-41'/., y..; breadth, i3-ió u. 



Spirota:;nia obscura Ralfs. Zygosp. similar to those of S. 

 condensata. 



Penium crassi use u lu m De Bar. Zygosp, similar to that of 

 P. p h y m a 1 s p o r u m , but the angles less prominent and more 

 rounded. 



P. Digitus (Ehr.) Bréb. Zygosp. globular, smooth, thick walled; 

 contents dense faintly yellowish green. Diam. 73,6 [j.; thickness of 

 cell-membr., 3,2 a. 



C s m e 1 a d i u m e n s t r i e t u m ( Arch.) Josh. Zygosp. globose, 

 with rather short stout spines. Diam. (ex. sp.), 17 20 u. (T. II, f. 7). 



Ferner sind Formen folgender Arten abgebildet : Hyalotheca 

 undulata Nordst. (T. I, f. i\ Staurastrum A vi cui a Bréb. 

 (T. Ili, f. Il', S. monticulosum Bréb. (T. Ili, f. 4), S. orbicu- 

 lare (Ehr.) Ralfs (T. Ili, f. 7), S. polytrichum Perty (T. Ili, f. 8), 

 S. saxonicum Bulnh. (T. IH, f. io\ S. se ti gè rum Cleve (T. Ili, 

 f. 9 \ X a n t h i d i u m a n t i 1 o p a) u m Kùtz. (T. Ili, f. 1 3), C o s m a- 

 rium eductum R et B. (T. I, f. 9), C, latum Bréb. (T. II, f. io\ 

 C. Logiense Biss (T. II, f. i5', C. plicatum v. majus Reinsch 

 (T. II, f. i), C. SI ewdru mense Roy (T. Il, f. 19;, C. trachypleu- 

 rum ó minor Rac. (T. I, f. i3), Docidium Farqu harsonii 

 Roy (T. IV, f. i\ Closterium Balmacarense Turn. (T. IV, 

 f. ij\ et ,3 minor Turn. (T. IV, f. 7), C. pseu dodi ance Roy 

 (T. I, f. 4), C. S co ti cu m Turn. (T. IV, f. 8), et v. fusiforme 

 Turn. (T. IV, f. 9). 



In der Synonymik machen die Verf. folgende Aenderungen : 



Was Staurastrum b r a s i I i e n s e Lund. De desm. p. 73, T. V, 

 f. 2 betrifft, sagt Roy nebenbei in der Einleitung, dass diese Form 

 voUstàndig mit S. multi come Grunow (in Rab. Algen Europas 

 N. 2IÓ5, 1870) ùbereinstimmt, warum er meint, dass der Name 



