CRYPTOGAMIA ALGJE. 267 



2. E. circularis^ bodies very minute, wedge-shaped, pellucid, 

 obscurely marked, arranged in a more or less complete circular 

 manner. GREV. Crypt, Fl. t. 35. 



Hob. On straws in ditches in early spring. 



This forms a flocculent mass of a fawn colour on straws, 

 along which it often extends for several inches. The bo- 

 dies seem bound together by a tenacious transparent jelly, 

 are exceedingly numerous, often separate, but as often 

 placed close side by side, and so arranged as to form a por- 

 tion of a circle, for I have never seen the circle complete. 

 Our description, -when compared with that of Dr GRE* 

 VILLE, will be found in some respects different, but the 

 peculiar form and disposition of the corpuscles seem suffi- 

 cient to identify the species. 



3. E. truncata^ bodies long, linear, truncate at both ends. 

 Exillaria truncata, GREV. Syn. 37. Echinella fasciculata, var. /3. 

 GREV. Crypt. FL t. 16. f. 4. 



Hab. On Conferva in fresh water. 



Grows separately or in clusters. I have often seen the bo- 

 dies divided into equal halves by a longitudinal line. 



4. E. acuta, bodies long, tapered at each end. LYNGB. Hydroph. 

 Dan. 209. f. 69. 



Hab. On the stones and mud at the bottom of still water. 



Covers the surface of the body on which it grows with a 

 brown dense coating in wide irregular spots, easily dis- 

 persed or diffused through the water. The corpuscles are 

 very numerous, translucent, without any markings. I 

 observed it in great profusion during a whole spring in a 

 rivulet in the immediate vicinity. Its increase was very 

 rapid, but as the spring advanced, and the confervae began 

 to vegetate, it quickly disappeared. It agrees with the 

 plant of LYNGBYE only in the size and shape of the gra- 

 nules, but in these doubtful vegetables they seem to afford 

 the only certain characters. 



5. E. lunulata, granules oblong, curved, slightly tapered at each 

 fend, marked in the middle with a dark line. 



Ilab. In streams, attached to other plants. Lumsden 

 Dean. August. 



M 2 



