HiEMATOCOCCUS. 333 



be composed of excessively minute granules, pellucid in the 

 centre with darker edges. Is it a Pabnella?''' 



15. HiEMATOCOCCUS yERUGINOSUS Hass. 



Plate LXXXII. Fig. 3. 



Char. Stratum (Bruginous greeuy firm. Granules minute, 

 mostly solitary, and not enclosed in cysts, somewhat angular, 

 occasionally in their ultimate devclopement associated in 

 pairs or 77udtiples of that nwnber and contained in a 

 globose vesicle. 



Palmella cBruginosa Carm., MS. 



Hab. Appin : Captain Carmichael. 



Of this species, remarkable for the richness of its colour, I 

 found a specimen in the herbarium of Sir W. J. Hooker. In 

 its microscopic character, it resembles somewhat H. lividus, 

 but is altogether a smaller plant. 



16. Il/EMATOCOCCUS THERIACUS Hass. 



Plate LXXVIII. Fig. 9. 



Char. Granules excessively minute, mostly solitary and sphe- 

 rical, but occasionally enclosed in cysts. 

 Hab. Eievaulx Abbey, Yorkshire : Dr. Allman. 



This is the most minute species of the genus. Dr. All- 

 man, who alone has noticed it, compares its appearance to 

 that of inspissated syrup. 



17. H^.MATOCOCCUS VULGARIS ZTrt^^. 



Plate LXXXI. Fig. 5. 



'Char* Cells many-cysted, of various sizes and forms. Gra- 

 nules angular, numerous in each cell, often repeatedly 

 divided into fours. 



Pleurococcus vulgaris IMenegh., Consp. p. 20. Chloi-ococcum 

 vidgare Grev., Scot. Cryjit. Fl. vol. iv. No. 2G2. 



