Bihliogyaphical Notices. 127 



ITliallus nearly wan ting. L. sphteroides, f. peralbafa, Nyl. 

 Tliallus powdery. L. sphceroides, f. micrubola, Acb. 

 Tballus verrucoso-granulate 61. 



PI j Spores 24 mik. long. L. sph<sroides, f. leucococca, Nyl. 



j Spores 19 mik. long. L. cupreo-rosella, v. chloroticoides, Nyl. 



p.-j I Apothecia 0*8-1 millim. in diameter 67. 



j Apothecia at most 0*7 millim. in diameter 63. 



i Apothecia constantly dark. L. sabidetot-um, v. miliaria, f. spha>- 

 ralis, Fr. 

 Apothecia pale or gradnally darkened 64. 



p. \ Paraphyses wanting or deliquescent 65, 



j Paraphyses nearly free ()6. 



( Hymenium at first tinted blue, then violet, by iodine, i. rtiji- 

 P^ J dula, Grtewe. 

 ' ■ 1 Hymenium at first tinted blue, then vinous yellow, by iodine. 

 ( X. spharoides, f. epixanthoides, Nyl. 



I Spores 4-5 times as long as broad. L. cupreo-rosella, v. fusco- 

 PP J viridis, Anzi (Anzi, Langob. 403). 



■ 1 Spores 2^-3^ times as long as broad. L. splicer oides, v. tylo- 

 ( carpa, Nyl. 



py j Apothecia graduallj- darkened into black 68. 



] Apothecia constant pale yellow or red-brown 70. 



po i Corticolar. L. sphceroides, f. versatilis, Nyl. 



j Saxicolar 69, 



[ Spores 20 mik. long. L. mpreo-roseUa, v. fuscoviridis, f. hriqru- 

 gg \ phila, Stizb. (Am. 20). 



1 Spores 30 mik. long. L. sabidctoriim, v. obscurata, f. muri- 

 ( cola, Nyl, 



( Apothecia sessile. L. sphceroides, Dicks. (Fellm. 158 ; Anzi, 

 ^Q j Langob. 261 ; Ilepp, 513 ; Schajr. 207 pp. ; Zw. 277), 

 ' ■ 1 Apothecia substipitate, pale below. L. sphceroides, v. stibstipi- 



( lata, Nyl. 



BIBLIOGRAPHICAL NOTICES. 



Flora Exiropcea Alffarum aquce (hilcis et suhmcirino'. Auctore Lu- 

 Dovico IIabenhoest, Philos. Dr., Ordinis Albrecht, Equito, Acad, 

 et Societ. plur. Sodali, 



The completion of Dr. Babenhorst's work upon the European 

 freshv^'ater Algae cannot fail to be acceptable to those botanists who 

 lave directed their attention to these much-neglected and ill- 

 understood organisms. The advance which has been made during 

 the last twenty years in the knowledge of these plants has almost 

 rendered obsolete what had previously been written upon the subject. 

 In England there is literally no work sufficient for students of 

 freshwater Algae. The ' English Flora.' Dillwjni and Grcvillc, must 

 now be looked upon as antiquated, and Hassall and Harvey's 'Manual' 

 as out of date. The great work of the latter author, viz. the 

 ' Phycologia Britanniea,' is limited to marine species. Mr. Berke- 



