146 



BOTANY 



deae. The latter must be regarded as an extremely specialized group 



without any near affinities 

 with other plants. 



There have recently been 

 shown among certain Fungi 

 (Ascomycetes) a type of 

 reproduction strikingly simi- 

 lar to that of the Florideae, 

 and it has even been sug- 

 gested that the two groups 

 may be related. This is, 

 however, by no means gen- 

 erally admitted, and at 

 present the higher Rhodo- 

 phyceae must be considered 

 to be widely separated from 

 all other plants. 



Fossil Rhodophyceae 



Some of the Corallineae, 

 which have a heavy in- 

 crustation of carbonate of 

 lime, have been very per- 

 fectly preserved in a fossil 

 condition; but the fossil 

 forms are all much like the 

 existing ones, and throw no 

 light upon the origin of the 

 group. 



The living genus Litho- 

 thamnion is common in the 

 FIG. 115. Corallina Mediterranea. a, section Mesozoic formations, but 



of conceptacle with zonate tetraspores ; there are other genera which 



o, cystocarpic conceptacle. (After THURET 



and BORNET.) are much older. 



BIBLIOGRAPHY 



'94. 1. Belajeff, W. Ueber die Bau und Entwickelung der Spermatozoiden. 



Flora, 1894 (supplement). 

 '97. 2. Brannon, M. A. The Structure and Development of Gnnnellia 



Americana. Ann. of Bot., XI, 1897. 

 '96. 3. Chester, G. D. Notes concerning the development of Nemalion multi- 



fidum. Bot. Gaz., XXII, 1896. 



