io CHYTRIDIACEAE 



x. Zoospores i-ciliate; resting sporangium smooth 



Olpidium 7: 310, S. 67 

 y. Zoospores 2-ciliate ; resting sporangium spiny or warted 



Olpidiopsis 7: 299, S. 69 

 (b) Zoosporangia with many openings 



Pleotrachelus 7: 315, S. 69 

 (2) Sporangia elongate or clavate Ectrogella 7: 315, S. 70 



2. Wall of sporangium fused with wall of host-cell 



Pleolpidium S. 70 



Subfamily Synchytriae 

 Schroeter 71 



Mycelium lacking; fruit-body endobiotic, when mature dividing simultaneously 

 to form zoosporangia grouped in rows or in a sorus ; resting sporangia arising di- 

 rectly from the fruit-body or by the division of it. 



I. Zoosporangia arising through direct division- of entire plasm of fruit-body, not 



surrounded by a common membrane 



1. Sporangia filling host-cell completely, wall fused with that of host-cell 



Rozella 7:300, S. 71 



2. Sporangia free, aggregated Woronina 7:301, S. 71 



II. Zoosporangia arising through division of the full-grown fruit-body, surrounded 



by the common membrane of the mother cell 



1. Sporangia formed directly from the full-grown fruit-body 



Synchytrium 7: 288, S. 72 



2. Sporangia formed from the division of a thin-walled mother-cell which escapes 



from the fruit body Pycnochytrium S. 73 



Subfamily Rhizidiae 

 Schroeter 75 



Fruit-body endophytic, epiphytic, or living free between the nutrient media, at 

 base with a slender (in epiphytic forms sometimes scarcely perceptible) often 

 branched mycelium, distinct for each fruit-body and imbedded in the matrix ; zoo- 

 sporangia globose or oblong, simple, often with a sterile swollen cell at base ; zoo- 

 spores globose, i-ciliate; resting sporangia formed asexually, usually like the zoo- 

 sporangia. 



I. Zoosporangia breaking out with an irregular or tube-like mouth, like the rest- 

 ing sporangia, which arise at the same place ; mycelium delicate 



1. Sporangia without basal cell, arising directly from mycelium 



a. Sporangia endophytic Entophlyctis 14:443, S. 75 



b. Sporangia epiphytic or free 



(1) Sporangia epiphytic, seated thickly on host-cell 



Rhizophidium 7: 298, S. 76 



(2) Sporangia free, mycelium only penetrating nutrient medium 



(a) Zoospores escaping singly Rhizophlyctis 14: 445, S. 77 



(b) Zoospores escaping as a ball Nowakowskia 7: 313, S. 77 



2. Sporangia with stalk-like or swollen basal cell 

 a. Sporangia with a stalk-like cell 



(1) Epiphytic; stalk separated by wall from sporangium 



