SECTIONAL TRANSACTIONS— K. 499 



They are of particular interest because they have an important bearing on 

 general problems of sexuality, alternation of generations, fungus phylo- 

 geny, etc. 



The following life histories are described : 



I. Allomyces. 



(a) Euallomyces — alternation of equal sporophyte and gametophy'te 

 generations ; discovered in A. javanicus by Kniep (1929, i93o) and con- 

 firmed in A. arbuscula by Hatch (i933). Sorgel (i937) and others. 



{b) Brachyallomyces — without alternation of generations, the sexual stage 

 apparently entirely lacking ; found by the writer to be the regular life cycle 

 in certain isolates and noted by Sorgel (i937) as a departure from the usual 

 cycle in A. arbuscula. 



(c) Cystogenes — without obvious alternation of generations but differing 

 clearly from (b) in the regular encystment of swarmers from resistant 

 sporangia ; discovered in four of his isolates and in A. moniliformis by 

 Emerson (1938). 



II. Blastocladia. 



Complete life cycle not yet demonstrated in any of the species ; import- 

 ance of recent work on germination of resistant sporangia (Blackwell (1937), 

 and growth of Blastocladia in pure culture (the writer, Sorgel 1938) is 

 emphasized. 



III. Blastocladiella, 



(a) Short cycle, corresponding with Brachyallomyces, discovered by 

 Matthews (1937) in jB. simplex. 



(b) Long cycle, corresponding with Euallomyces, discovered by Harder 

 and Sorgel (1938) in Rhopalomyces variabilis (probably a species of 

 Blastocladiella) . 



The similarities and probable relationships between members of the 

 three genera are briefly discussed. 



Dr. W. R. IviMEY Cook. — The phycomycete flora of Glamorgan ; general 

 scheme (2.45). 



A study of the Phycomycete Flora of the British Isles is a matter which 

 has not so far received much attention at the hands of mycologists. Isolated 

 accounts of individual members of certain groups exist, but with certain 

 exceptions, no complete monographical account, such as has been made in 

 Europe and America, has been attempted. With a view to improving this 

 situation, a start was made in 1932 to compile a Phycomycete Flora of the 

 county of Glamorgan. During the subsequent six years, with the aid of 

 various research students, the work has been continued, and although much 

 still needs to be completed, sufficient information is available to justify a 

 report on the progress of the work. 



In 1936 the first volume, ' Natural History,' of the Glamorgan County 

 History appeared and in it the author published the first list of the Phyco- 

 mycetes known to occur in the county. Since then the number has been 

 increased and at the present time 176 species have been recorded. In the 

 course of the work 42 species new to the country have been found, while 

 9 species new to Science have been discovered. 



