CHYTRIDIALES 189 



vided with a single fairly long gradually tapering tube, the tip of which 

 penetrates the wall of the substratum; zoospores narrowly ovoid, 

 with a strongly acuminate apex and a small basal colorless globule, 

 uniflagellate, emerging through the open end of the discharge tube; 

 resting spore not observed. 

 In dead eelworms, European Russia, Asiatic Russia. 



IMPERFECTLY KNOWN SPECIES OF BICRICIUM 



? Bicricium naso Sorokin 

 Arch. Bot. Nord France, 2: 37, fig. 47. 1883 (separate) x 



Sporangia narrowly ovoid, one in each semicell of the alga, the 

 narrower end terminating in a distinct swelling which gives rise to a 

 long discharge tube penetrating the wall of the substratum and elon- 

 gating for a considerable distance outside, the isthmus joining the two 

 sporangia consisting of a long narrow tube; all other characters un- 

 known. 



In Arthrodesmus sp., Asiatic Russia. 



Sorokin suggests that the parasites of desmids figured by Reinsch 

 (1878: pi. 17, figs. 6, 11-12) might better be placed in Bicricium, rather 

 than in Myzocytiwn, where Cornu (1877b: 228) said they belonged. 

 A comparison of Reinsch's figures with those of Myzocytiwn by Zopf 

 (1884: pi. 14), leaves little doubt as to the correctness of Cornu's 

 contention. It is probable that the present species of Bicricium, with 

 its discharge tube bearing a bulbous endobiotic base, also belongs 

 in Myzocytiwn, since it has a very different aspect from the other species. 



? Bicricium transversum Sorokin 



Arch. Bot. Nord France, 2: 37, fig. 46. 1883 (separate) 2 



(Fig. 151, p. 186) 



Sporangium narrowly ellipsoidal, with a narrow discharge tube; 

 zoospores not observed; adjacent cell subspherical, bearing a spherical 

 thick-walled resting spore, method of formation and germination 

 unknown. 



In filaments of Clac/ophora sp., Asiatic Russia. 



1 Ibid., pi. 81, fig. 117. 1889. 



2 Ibid., pi. 78, fig. 76. 1889. 



