358 ALGJE cONFERVOIDEiE [Conferva. 



40. C. diffusa, Roth, (diffuse green Conferva); filaments 

 membranaceous rigid dark-green flexuose subdicliotomous, 

 branches distant elongated furnished towards the top with a few 

 short patent secund ramuli, articulations & — 4 times longer than 

 broad.— Dillw. Conf t.2\. E.Bot.t.2289. Ag. Syst. Alg. p. 116. 

 — C. distans, Ag. Syst. Alg. p. 120. 



Marine rocks ; Swansea, Dillwyn. Devonshire, Mrs. Griffiths. Mil- 

 town Malbay, W. H. Harvey.— Nearly allied to C. nqjestris, but differ- 

 ing in habit. Agardh founds a species on the British C. diffusa, which 

 he calls C. distans ,• and states it to be nearly allied to C.pellucida. Our 

 plant, which we are convinced is that of Mertens and Roth, is very 

 nearly allied to C. rupestris, but not at all to C. pellucida. 



41. C. dlbida, Huds. (whitish cottony Conferva); filaments 

 very slender capillary flaccid pale yellow-green forming dense 

 silky tufts, branches crowded irregular, the uppermost ones 

 patent and mostly opposite, ramuli opposite or secund, articu- 

 lations 4 — 5 times longer than broad. — Dillw. Conf. Syn. p. 66. 

 /. E.—E. Bot. t. 2327.— C. heterochloa, Ag. Syst. Alg. p. 1 IS- 

 C', refracta, Ag. Syst. Alg. p. 114, (reference to E. B.) — /3. 

 protensa; elongated, ramuli straight patent irregular. Dillw. Conf. 



On other Algce ; perhaps common. Cromer, Mr. Turner. Bantry, 

 Miss Hutchins. Brighton, Mr. Borrer. Torbay, Mrs. Griffiths. — Fila- 

 ments very slender, excessively branched and tufted, pale-green, quickly 

 fading to a dirty white, lesser branches opposite. Habit very nearly 

 that of an Ectocarpus. 



42. C. lanosa, Roth, (woolly green Conferva); filaments slender 

 short yellow-green forming dense tufts, branches virgate erect 

 subdistant straight alternate or opposite, with a few alternate or 

 secund ramuli, axils very acute, lower articulations twice, upper 

 six times as long as broad. — Dillw. Conf. Syn. t. E. — E. Bot. 

 *. 2099. Ag. Syst. Alg. p. 112. 



On rocks and the larger Algce ; not uncommon. — Filaments forming en- 

 tangled woolly tufts, an inch long, pale-green, stoloniferous below, 

 branches straight and erect, all the axils very acute. It adheres to paper 

 in drying, and in that state is usually of a dull whitish-green, without 

 gloss : — nearly allied to C. arcta. 



43. C. centralis, Lyngb. (radiating green Conferva); filaments 

 elongated forming broad somewhat starry tufts of a full-green 

 colour much branched, branches straight crowded erect, ramuli 

 sub-appressed opposite or alternate, articulations twice as long 

 as broad. — Lyngb. Hydroph. Dan. p. 161. t. 56. El. Dan. 



Rocks on the verge of high-water mark. Bathing Cove, Torquay, 

 Mrs. Griffiths. — Tufts flat, round, radiating from the centre : ji laments 

 2 — 6 inches long, slender, much branched, and somewhat interwoven, 

 stoloniferous, of a bright-green colour, which is but partially preserved 

 in drying ; joints pretty regularly twice as long as broad throughout the 

 filament. The figure in Fl. Dan. is strikingly characteristic of our spe- 

 cimens, especially the magnified portion ; that hi Lyngbyc's work is not 

 so good. 



