254 LAGERHEIM, BIDRAG TILL AMERIKAS DESMIDIÉ-FLORA. 



XVII. CLOSTERIUM Nitzsch 

 Beitr. zu Infus, pag. 60 et 67. 



1. C. Lunula (MÜLL.) NiTZSCH 



Beitr. zu Infus, pag. 60 et 67; Vibrio Lunula Müll, in Natur- 

 forscher XX, 1784, pag. 142, sec. Ralfs. 

 Long. cell. 645 /.i; lat. max. cell. 100 f.i; lat. apic. cell. 20 ,h. 

 Cuba. 



2. C. acerosum (Schrank) Ehrenb. 



Beitr. z. Erk. gr. Organ, pag. 68; Vibrio acerosum SCHRÄNK 



Fauna Boica, III, 2, pag. 47. 

 Tewksbury, Mass. 



3. C. costatum CoRDA 



Alm. d. Carlsb. 1835, pag. 124, tab. V, fig. 61—63. 



Long. cell. 230 — 270 ^t/; lat. max. cell. 33 ^it; lat. apic. cell. 12 ^<. 



Tewksbury, Mass. 



4. C. siibcostatum NoRDST. 



in WiTTR. et NORDST. Alg. exs. fasc. 8, N:o 370. 

 Cuba. 



5. C. aiig-ustatum KÜTZ. 

 Phyc. germ. pag. 132. 



Long, semicell. 240 /<; lat. max. cell. 20 jt<; lat. apic. cell. 15 u. 

 Tewksbury, Mass. 



6. C. juncidura Ralfs 



Brit. Desm. pag. 172, tab. XXIX, fig. 6. 



Long. cell. 310 «; lat. max. cell. 12 f.i; lat. apic. cell. 7 {.i. 



Tewksbury, Mass. 



XVIU. SPIROT^ENIA Bréb. 



in Ralfs Brit, Desm. pag. 178. 



1. S. condensata Bréb. 

 in Ralfs. Brit. Desm. pag. 179, tab. XXXIV, fig. 1. 

 (Juba (c. zygosporis). 



