CHYTRIDIALES 319 



the substratum, 13-14 \x long by 6-8 [x in diameter, wall thin, smooth, 

 colorless; endobiotic part not observed; zoospores not observed, ap- 

 parently emerging through the broad open apex; resting spore not ob- 

 served. 



On cyst (?) of an unidentified chrysomonad, Hungary. 



The description is lacking in too many essential features for the fun- 

 gus to be placed anywhere generically. 



DANGEARDIA B. Schroder 



Berichte Deutsch. Bot. Geseli., 16: 321. 1898 

 (Figs. 19 C-E, p. 318; 20, D, E, p. 330) 

 Thallus intramatrical, epi- and endobiotic, monocentric, eucarpic. 

 consisting of the rudiment of the sporangium, which is sessile on the 

 host contents but imbedded, except for its apex, in the gelatinous sheath 

 of the host, and a complex of short unbranched or branched rhizoids; 

 sporangium inoperculate, zoospores posteriorly uniflagellate, with a 

 single globule, some having, in addition, a minute rod-shaped os- 

 cillating anterior granule, formed in the sporangium, liberated through 

 an apical pore; resting spore epibiotic, with a thick smooth, spiny or 



infection tube (appendix) are still persistent. F. Achlyella flahaultii Lagerheim, 

 sporangium on surface of Typha pollen; zoospores have encysted after dis- 

 charge from sporangium. G. Physorhizophidium pachydennum Scherffel, spo- 

 rangium on surface of diatom (Amphora?); upper half of knoblike subsporan- 

 gial structure rests on surface of host; lower half is within it. H. Phlyctochy- 

 trium bullatum Sparrow on Oedogonium, epibiotic sporangium ornamented 

 with outer whorl of six bosses and inner whorl of four bifurcated teeth ; sub- 

 sporangial apophysis from which rhizoidal system arises is endobiotic. /. 

 Phlyctochytrium planicorne Atkinson on Cladophora, discharging sporangium 

 ornamented with four plain apical teeth surrounding discharge pore through 

 which zoospores are emerging. J-K. Loborhiza metzneri Hanson on repro- 

 ductive cells of Volvox carteri: J, empty sporangia showing internal prolif- 

 eration and beginning of a new sporangium; K, resting spores showing strong- 

 ly lobed haustorial apparatus. L-M. Septosperma rhizophydii Whiffen on 

 Rhizophydium macrosporum: L, sporangium; M, immature thallus and two- 

 celled resting spore. 



(A-B, Sparrow, 1933c; C-E, Schroder, 1898b; F, Lagerheim, 1890; G, 

 Scherffel, 1926a; H-I, Sparrow, 1938c; J-K, Hanson, 1944a; L-M, Whiffen, 

 1942a) 



