1070 AQUATIC PHYCOMYCETES 



Parasitic in Closterium sp., Berdan (1938: 407, figs. 9-22), Canada; 

 Closterium areola turn, Berdan (op. cit. : 397), United States ; Closterium 

 sp., John (1955: 93, figs. 13-15), India. 



Ancylistes berdanii was described by Berdan (1938) and identified 

 with A. pfeifferi Beck from Brazil. As she pointed out, however, and as 

 is perfectly clear from his description, Beck (1896) based his species on 

 a mixture of Ancylistes and Myzocytium (probably M. megastomum). 

 The name of a taxonomic group "... must be rejected if the characters 

 of that group were derived from two or more entirely discordant ele- 

 ments, especially if those elements were erroneously supposed to form 

 part of the same individual." x Opportunity is therefore afforded to 

 honor one who has contributed so significantly to the genus. 



Ancylistes netrii Couch 



J. Elisha Mitchell Sci. Soc, 65: 132, pis. 6, 7. 1949 



(Fig. 91 C-F) 



"Vegetative mycelium within the protoplast of host cell, consisting 

 upon reaching mature size of a branched non-septate thread which 

 usually starts its growth near the isthmus of the desmid in contact with 

 the host nucleus and then elongates in opposite directions toward the 

 ends of the desmid; at first non-segmented and 2.2-4.8 u. thick; when 

 mature consisting of 3-6, usually 4, longitudinal branches which join in 

 the isthmus of the desmid, becoming septate into numerous cells which 

 are usually about 2-3 times as long as thick, measuring 8-15.5 x 15-30 

 \l; cytoplasm with numerous rounded granules and conspicuous round 

 vacuoles; cells becoming conspicuously swollen just before and during 

 germination. Reproduction by vegetative, asexual and sexual methods; 

 all cells of thallus taking part in reproduction. In vegetative and asexual 

 reproduction exit tubes are formed (one from each cell as a rule) and 

 grow out at right angles or slightly diagonally from the parent cell and 

 after coming in contact with the host wall swell distally to form a club- 

 shaped structure about 2-4 \x. thick at the base and 4-9 u thick at the 

 larger end; if submerged the exit tube, after emerging through the des- 



1 International Code of Botanical Nomenclature, Article 66. VIII, Intern. Congress 

 Bot., Pans. Utrecht, 1956. 



