MlCROSPORA 173 



matophore, which permits a clear view of the nucleus, while in the 

 related species, the nucleus is distinctly seen only after fixation or 

 staining. Furthermore, this form always gave a very feeble test 

 for starch, while the other species are generally rich in starch. 

 Even in the field the much lighter green color was noticeable. 

 The recent collection made in Vermont only confirms our view as 

 to the distinctness of this species. 



As to the definition of M, Wittrockii there is some confusion ; for 

 in Professor Wille's original description the species had a diameter 

 of 1 2-20 //, while in his German revision of the paper he increased 

 it to read 20-24 fi. The specimen in Wittr. & Nordst. Alg. Exsic. 

 4.22, seems to agree with the first description. The details given 

 in the revised description, however, together with the accompany- 

 ing illustrations, leave no doubt that our form is to be identified 

 with this species. 



5. Microspora floccosa (Vauch.) Thuret, Ann. Sci. Nat. Bot. 



III. 14: 221, 222. pi. iy. f. 4-j. 1850. Cooke, Brit. F. W. 



Alg. 136.//. 33. f 3. 1883. DeToni, Syl. Alg. 1 : 226././. 



1889. DeWild. Flor. Alg. Belg. 46. 1896; Flor. Buit. 63. 



1900. 



Prolifera floccosa Vaucher, Journ. de Phys. 52: //. 4../. 12. 

 1800; Hist. Conferv. 131.//. 14./. 3. 1803. (?) 



Conferva floccosa Agardh, Disp. Alg. Suec. 29. 1812; Alg. 

 Dec. 19. 181 3 ; Syn. Alg. Scand. 79. 1817; Syst. Alg. 89. 

 1824. (?) Wolle, F. W. Alg. 140. //. 120. f. 2i-2g. 1887. 



Conferva fugacissima Lyngb. Tent. Hyd. Dan.//. 46. f 1-4. 



1819. (?) 



Lyngbya floccosa Hass. Brit. F. W. Alg. 223. pi. 60. f 1, 2. 



1845. (?) 



Hormiscia floccosa Derb. & Sol. Mem. Phys. Alg. 16. pi. 3. f. 

 1-8. 1856. (?) 



Not C floccosa Lyngb. Tent. Hyd. Dan. 138.//. 4.6 B. 181 9 

 {=Stichococcusf). Kiitz. Spec. Alg. 371. 1849; Tab. Phyc. 3 : 

 pi. 43. f 3. 1852. Kirchn, Krypt. Flor. Schles. 2 1 : 79. 1878. 

 Wille, Ofvers. Vet.-Akad. F6rhand. 1881 8 : //. jo. f 47-49. 

 1881. Hansg. Prod. Alg. Bohm. 1 : 75. 1886. 



Not M. floccosa Rabenh. Krypt. Flor. Sachs. I : 245. 1863 ; 

 Flor. Eur. Alg. 3: 321. 1868. 



