228 ALGyE CHLOROSPEKME*:. [Conferva. 



26. C. glomerata, Linn. Green cluttered Conferva. Root 

 scutate ; filaments tufted, bushy, subrigid, bright green ; 

 branches crowded, irregular, erect ; ultimate ramuli secund, 

 subfasciculate ; articulations 4 8 times longer than broad. 

 Dillw. t. 13. . Bot. t. 2192. Harv. L c. p. 356. C. latevi- 

 rens, Dillw. t. 48. E. Bot. t. 1854. 



In streams and rivulets and in the sea, common. If all the supposed 

 marine varieties of this species really appertain to it, none can be more 

 polymorphous. But I incline to think that more than one species is 

 confounded under this name. The branched marine Conferva, in- 

 deed, require great revision, and I earnestly recommend them to the 

 attention of those whose residence gives them an opportunity of 

 watching these plants in their places of growth. 



27. C. cegagropila, Linn. Globe Conferva or Moor Balls. 

 Filaments issuing from a central point, forming dense roundish 

 balls; branches erect, subsecund, straight; articulations 3 4 

 times longer than broad ; the uppermost cylindrical, the lower 

 swollen upwards. E. Bot. t. 1377. Dillw. t. 17. Harv. in 

 Hook. Br. Fl. v. ii. p. 357. 



In lakes, very rare. Cunnamara ; J. T. Mackay. This curious 

 plant forms a compact ball, varying in diameter from halt' an inch to 

 a 4 inches. It is said to be used as a pen-wiper. 



' 



b. Inhabits maritime rocks, wet toith fresh water, and only occa- 

 sionally exposed to the tide. 



28. C. Prownii, Dillw. Dr. Browns Conferva. Filaments 

 densely caespitose, erect, rigid, flexuose, elastic, slightly 

 branched ; branches few, long, subsimple, secund ; axils acute ; 

 articulations 4 5 times longer tban broad, the lower ones 

 thickened upwards, the upper cylindrical. Dillw. Suppl. t. D. 

 Harv. in Hook. Br. Fl. v. ii. p. 356. 



On wet rocks at a cave near Dunrea, Ireland ; 21. Brown, Esq. 

 On shady rocks at the entrance of a small cave beyond Black Castle, 

 Wicklow, where it is exposed to the dripping of fresh water, and the 

 occasional overflow of the tide. Tufts spreading, 1 inch high, 

 dark glossy green. Filaments densely matted together, appearing to 

 originate in a mass of creeping roots. This has a good deal the ap- 

 pearance of a Vaucheria, but the structure and substance is totally dif- 

 ierent. It is not allied to any species I know of, except, perhaps, C. 

 agagropila. 



c. Marine. 



29. C. pellucida, Huds. Pellucid three-branched Conferva. 

 Filaments cartilaginous, rigid, erect, brigbt-green ; trichoto- 

 mous; axils very acute, branches erect; articulations many 

 times longer than broad. Dillw. Cortf. t. 90. E. Bot. t. 1716. 

 (excellent.) Harv. in Hook. v. ii. p. 357. 



