H^EMATOCOCCUS. 333 



]be composed of excessively minute granules, pellucid in the 

 centre with darker edges. Is it a Palmella?" 



15. HJEMATOCOCCUS JERUGINOSUS Hass. 



Plate LXXXIL Fig. 3. 



Char. Stratum aruginous green, firm. Granules minute, 

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

 occasionally in their ultimate developement associated in 

 pairs or multiples of that number and contained in a 

 globose vesicle, 



Palmella aruginosa 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. ILEMATOCOCCUS THERIACUS HttSS. 



Plate LXXVIII. Fig. 9. 



Char. Granules excessively minute, mostly solitary and sphe- 

 rical, but occasionally enclosed in cysts, 



Hab. Rievaulx 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 HttSS. 



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 Menegh., Consp. p. 20. Chlorococcum 

 vulgare Grev., Scot. Crypt. Fl. vol. iv. No. 262. 



