224 MONOCYSTE^E. 



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

 Bogs at Fisher's Casfrle : Mr. Jenner. 



This very beautiful species is by no means common. It 

 inhabits generally ponds on commons and other exposed situ- 

 ations. 



8. LYNGBYA VERMICULARIS 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. 



Hob. 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 layer. Annuli from 

 the minuteness of the filament almost inconspicuous." Grev. 



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

 Cladophora, C. pellucida, C.rectangularis, C. Hutchinsice, C.diffusa, C. 

 nuda, C. rupestris, C. Icetevirens, C. flexuosa, C. gracilis, C. refracta, C. 

 albida, 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, ulothrix, arenosa, melargonium, cerea, col- 

 labens, bangioides, Youngana, and clandestina. 



