COCCOCHLORIS. 317 



fronds adhere closely to paper, present considerable gloss, 

 and retain the freshness and depth of their colouring when 

 dried. 



" I have much pleasure in ascribing it to its acute dis- 

 coverer Mr. D. Moore, curator of the Royal Dublin Society's 

 Botanic Garden, who has added so many interesting plants 

 to the Irish Flora." Harv. 



Having only had the opportunity of examining dried spe- 

 cimens, I am not able to give the measurements of the 

 globules and vesicles ; I have, however, been able to ascertain 

 sufficient of the species to render it quite certain that the 

 reference to the genus Coccochloris is correct. The same re- 

 mark applies to the other species which I have placed in 

 that genus. 



6. COCCOCHLORIS RIVULARIS Hass. 

 Plate LXXVIII. FigB. 6 a. b. 



Char. Fronds hemispherical, tuberculose, often confluent, 

 bright green when recent, turning to brown in drying. 

 Globules small, globose, scattered. 



Palmella rivularis Carm., MS. P. rivularis Harv., in Hook. 

 Brit. Flor. p. 397. ; Harv. in Manual, p. 177. 



Hab. In a mountain streamlet, attached to rocks and 

 stones, Appin: Captain Carmichael. 



" Fronds one fourth or half an inch in diameter, hemi- 

 spherical, tubercular, firmly adhering, sometimes cohering 

 into a broad crust. Granules small, globular, scattered. 

 Colour vivid green. It bears a striking resemblance to Chce- 

 tophora tuberculosa" Carm. MSS. In drying it shrinks 

 considerably, and fades to dirty brown.* 



* In a specimen which I have lately examined of this species, I dis- 

 tinctly perceived divisions in the mucous substance ; a certain number, 

 usually two, of the granules, as in the genus Hcematococcus, being invested 

 with a separate portion of the general substance. It is probable that this 

 structure belongs to all the species of the genus, and possibly of Ulva also. 



