SYNCHYTRIACEAE 



31 



Subfamily Olpidiae 



Zoospores posteriorly 1-ciliate 



A. Sporangia free in the host-cell 



1. Sporangia globoid 



a. Sporangia opening by 1-x tubes or by a pore 



(1) Resting spore with 1-x companion-cells; 



in Spirogyraceae 



(2) Resting spore without companion-cells 



b. Sporangia opening by many more or less 



radiate tubes 



2. Sporangia ellipsoid to fusoid or tubular 



a. Sporangia ellipsoid to fusoid, opening at one 



or both ends by a pore or papilla; in 

 Protozoa 



b. Sporangia tubular; tubes many, short, in 1-2 



rows; in Bacillariaceae 



B. Sporangia fixed in host-cell, the walls appressed 



or fused 



1. Sporangial wall appressed to that of host-cell; 



in algae (Oedogonium) 



2. Sporangial wall completely fused with that of 



host-cell; in Phycomycetes 



Pseudolpidiopsis 76 

 Olpidium 73; plate 1 



Pleotrachelus 78 



Sphaerita 72 

 Ectrogella 77 



Plasmophagus 79 

 Pleolpidium 78 



Subfamily Woroninae 

 Zoospores laterally biciliate; regularly in Saprolegniaceae 



A. Sporangia short-cylindric, seriate, filling the host 



hypha 



B. Sporangia globose to saccoid, not seriate 



1. Sporangia 1-x, separate 



a. Resting spore with 1-x companion-cells 



b. Resting spore without companion-cells 



2. Sporangia many, forming a more or less defi- 



nite sorus 



Rozella 68 



Diplophysa 67; 1 

 Olpidiopsis 67 



Woronina 69 



Family 2. SYNCHYTRIACEAE 



Fitzpatrick 80; Minden 278 



Mycelium lacking; cells endobiotic in higher plants, producing galls, early de- 

 veloping a membrane, finally becoming a resting sporangium or dividing to form a 

 sorus of sporangia enclosed in a membrane; zoospores posteriorly 1-ciliate. 

 (^ne genus Synchytrium 80; 1 



Addendum. Protomycetaceae 



Mycelium scanty, of delicate septate branching intercellular hyphae bearing 

 terminal or intercalary unicellular chlamydospores which finally germinate, pro- 

 ducing numerous small simple non-motile spores in the endospore, which is expelled 

 in the form of a globose or cylindric sack, the latter bursting at maturity to free 

 the spores; parasites on higher plants. 



A. Chlamydospores formed irregularly in the sub- 

 epidermal tissues 



1. Chlamydospores smooth 



Protomyces 7:319, F 305 



