224 aiONOCYSTEiE. 



Hah. High Beech : A. H. H. Penzance : 3Tr. Ralfs. 

 Bogs at Fisher's Castle : 3l7\ Jenner. 



This very beautiful species is by no means common. It 

 inhabits generally ponds on conmions and other exposed situ- 

 ations. 



8. Lyngbya vermiculaeis Hass. 

 Plate LX. Fig. 5. 



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

 yreen colour, finer than those of the preceding species. 

 Cells ticice or thrice as long as broad. Endochrome 

 rarely filling the cavity of the cell. 



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



Sussex : Mr. Jenner. 

 A common species in boggy pools. 



9. Lyngbya prolifica 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 laj^er. Annuli from 

 the minuteness of the filament almost inconspicuous." — Gj-ev. 



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

 Cladophora, — C. pellucida, C.rectangularis, C. Hutchinsia, C. diffusa, C. 

 nuda, C rupestris, C. Icctevirens, C. flexuosa, C. g?-acilis, C. rcfracfa, C. 

 albida, C. lanosa, C. uncialis, C. glaucescens, C. carta, C. cervginosa, and 

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

 sutoria, Limun, crassa, implexa, ulothrix, arenosa, melargoiiium, cerea, col- 

 labens, hangio'idcs, Youngana, and clandestina. 



