326 PROTOCOCCE^E. 



Second Subgenus. Mucous appendage wanting. Granules 

 one, two, or four, in each cell. 



Obs. It is possible that subsequent research may prove 

 that one or more of the species of this section should be re- 

 ferred to the first subgenus. 



a. Investing vesicles numerous. 



6. H^MATOCOCCUS RUPESTRIS HttSS. 



Plate LXXXII. Fig. 1. 



Char. Granules spherical, olive green, single, sometimes binate, 

 very small, each enclosed in several distinct enveloping 

 vesicles. 



^ Palmella rupestris Lyngb., Hydroph. p. 207. t. 69. D. 

 \ P. rupestris Ag., Syst. p. 13. Microcystis rupestris Kiitz., 

 ^ Linnaea, p. 374. No. 9. Microhaloa rupestris Kiitzing, 

 Phycologia Generalis, p. 169.; Harv. in Hook. Br. Flora, 

 ii. 397. ; also in Manual, p. 178. ; Meneghini loc. cit. 

 ** Hob. On moist overhanging cliffs, Appin : Capt. Car- 

 \ michael. Aberdeen: Dr. Dickie. On moist conglo- 

 merate sandstone caves near Cushendall, co. Antrim : 

 Mr. Moore. 



" Frond hyaline, gelatinous, yellowish green, easily broken 

 up, about an inch in diameter, shapeless, rough; pellucid, 

 more dense in the centre and elevated ; when dried, collapsed ; 

 blackish, cartilaginous, fragile. Subjected to the micro- 

 scope, it appears constituted of hyaline subspherical vesicles, 

 enclosing yellowish green, spherical or slightly oblong glo- 

 bules, usually undivided. Solitary globules, magnified with 

 glasses less powerful, are seen free and naked ; by means of a 

 more powerful microscope, almost all are perceived to be 

 clothed with a proper cyst, larger vesicles enclose smaller, 

 and the whole frond appears areolated, the hollow areolse con- 

 taining solitary or binate globules. The vesicles, general as 

 well as partial, duplex, triplex, or multiplex, and that without 



