224 MONOCY8TEJE. 



Hob. High Beech : A. H. H. Penzance : Mr. Rolfs. 

 Bogs at Fisher's Castle : Mr. Jenner. 



This very beautiful species is by no means common. It 

 inhabits generally ponds on commons and other exposed situ- 

 ations. 



8. LYNGBYA VEKMICULARIS Hass. 

 Plate LX. Fig. 5. 



Char. Filaments very mucous, tenacious, and of a yellowish 

 green colour, finer than those of the preceding species. 

 Cells twice or thrice as long as broad. Endochrome 

 rarely filling the cavity of the cell. 



Hab. High Beech : A. H. H. Penzance : Mr. Ralfs. 

 Sussex : Mr. Jenner. 



A common species in boggy pools. 



9. LYNGBYA PBOLIFICA Grev. 

 Plate VIII. Fig. 4. 



Char. Filaments exceedingly slender, entangled, purple, very 

 broadly effused, fioating. 



Grev. Crypt. Fl. t. 303. ; Harv. 1. c. p. 370. ; also in Manual, 



p. 160. 

 Hab. In the loch of Haining, Selkirkshire, October to 



April: Dr. Greville. 



" Plant extensively diffused, forming a floating stratum, 

 of a rich purple colour. Filaments extremely slender, en- 

 tangled, somewhat rigid, yet flexible, entirely destitute of 

 attachment, and free from any mucous layer. Annuli from 

 the minuteness of the filament almost inconspicuous." Grev. 



Note. The following marine Alga I regard as members of the genus 

 Cladophora, C. pellucida, C. rectangidaris, C. Hutchinsia, C.diffusa, C. 

 n mil i. C. rupestris, C. Icetevirens, C.jftexuosa, C. gracilis, C. refracta, C. 

 (ilbidu, C. lanosa, C. uncialis, C. glaucescens, C. arcta, C. ceruginosa, and 

 C. riparia ; while in Aplonema I place the subjoined Conferva, arenicola, 

 sutoria, Linum, crassa, implexa, idothrix, arenosa, melargonium, area, col- 

 labens, bangio'ides, Youngana, and clandestinu. 



