CRYPTOGAMIA. 497 



ccptaculnm for his apotliecium, pcdicdhis 

 tor his hac'iUum or podetiiim, and scmina 

 for his sporcBy because I see no improve- 

 ment in the cliange. When this or any 

 other writer strikes out new ideas, and 

 discriminates parts hitherto mistaken or 

 unknown, we thankfully receive from him 

 new terms to express his discoveries. Thus 

 the a/phclla of Acharius is a peculiar sort 

 of pit or pore on the under side of the frond 

 in that section of Lichens called Sticta, see 

 Engl.Bot.t. 1103, 1104; his Urdla are 

 the black letter-like receptacles of the ge- 

 nus Opegrapha, t. 1753 — 1756 ; his triccB 

 the analogous parts, resembling a coiled 

 horse-hair, in Gyrophora, the Umhilicarna 

 of Hoffmann, t. 522. These terms are 

 necessary and instructive, and are chosen 

 with that accuracy and taste for which 

 Dr. Acharius is conspicuous. 



The aquatic or submersed Algaiorva a 

 distinct and peculiar tribe. Some of these 

 abound in fresh water, others in the sea, 

 whence the latter are commonly denomi- 

 nated sea-weeds. The chief genera are 

 Viva, L 419, 420, 1276, well defined by 

 2 K 



