42 ! LIN8 wi> hi i;\ El . 



citable to the eye, it was noticed only in the examination of the 

 Codium material preserved in formalin, bo that nothing can be said 

 as to the character- of the supposed Eoospores; everything wai how* 

 ever similar to the formation and emission of eoospores in the lai 

 and better known speeies of Ckaetomorpha. Emptied cells \ 

 common, sometimes every cell of a filament being fertile, even the 

 basal cell; in one instance a filament consisted of ;i single cell, which 

 had emptied itself through the small round lateral opening. In the 



form of the cells, thick laminate wall, dense chromatophore with many 

 pyrenoids, the plant is a microscopic copy of forms like ('. I. /num. 

 Rather curiously, it is the only attached form we find in the islands. 

 The type is in the Collins herbarium. 



2. ( . gra« n.is Kiitzing, 1845, p. 203; L853, p. 17, PI. LII, fig. 1 

 P. B.-A.. No. 2162. Hungry Bay, in dense masses, April, Collins. 



3. C. BBACHTGONA Harvey, 1S5S, p. S7, PI. XLVI. A; Collin.-, 



1909, p. 325. Pish pond, Walsingham, Nov., Hervey. Lying loose on 



the bottom of the pond. 



4. C. Lixum (Fl. Dan.) Kiitzing, 1845, p. 204; ('. aerea forma 

 Linum Collins, 1909, p. 325; P. B.-A., No. 1S63. Conft Linum 

 Flora Danica, Vol. V, p. 4, PI. DCCLXXI, 1782; Harvey, 1846-51, 

 PI. CL. A; Moseley; Rein, as C. geniculate; Hungry Bay, Pool by 

 Moore's calabash tree, April, Collins; Walsingham, Causeway, Nov., 

 Tucker's Town, Dec., Hervey. Common and variable. 



5. C. < RASSA Ag.) Kiitzing, 1S45, p. 204; 1853, p. 19, PI. LIX, 

 fig. 11; P. B.-A., Xo. 1SG4; Conferva crassa Agardh, 1824, p. 99. 

 Kemp, as Hormotrichum; Pool near Walsingham, April, Lagoon near 

 Fairyland, Aug., Collins. Xot always easily distinguishable from 

 C. Linum; study of the various forms in their natural condition if 

 continued over a considerable time, might lead to considerable re- 

 arrangement. 



Rhizocloxhm Kiitzing. 



1. CelLs rarely under 30 /t diam., wall thick, often lamellate. 2. 



1. Cells rarely over 30 ft (ham., usually 10-25 ju. 3. 



2. Filaments 50-100 m diam., usually with frequent short branches. 



\. R. Bookeri. 



2. Filaments 33-44 n dia in. branching from basal < , < , 11 only. 



5. l: crasaipellitum. 

 3. In fresh or slightly brackish water. 2. R. bieroglyphicum. 



3. In salt water. ' 4. 



}. Cells 20-25 m diam. 3. R. riparium. 



i. Cells 10-15 m diam. 1. R. Kerneri. 



