324 



Mycologia 



the generally androgynous origin of its antheridia. However, 

 from the figures of DeBary and Horn of A. polyandra DeBary 

 (A. DeBaryana Humphrey), our plant seems really to be very 

 near that species; and it seems best, at present, to extend some- 

 what the limits of A. DeBaryana so as to include Horn's form 

 and our Chapel Hill plant. 



Meanwhile, if Achlya prolifera can be found again, it should 

 be carefully studied and the limits of its variation determined. 

 li the other two are not distinct from it, then its name must be 

 extended to all of them. 



Chapel Hill, North Carolina. 



Fig. I 



Explanation of Plate LXXVIII 

 A typical group of chlamydospores. X 75. 



Fig. 2. Chlamydospores of another form. X 75. 

 Fig. 3. Several sporangia of the short, thick type. X 75. 

 Fig. 4. A sporangium opening by two tubes. X 75- 

 Fig. 5. Sporangia of a longer and narrower type. X 75. 

 Fig. 6. A sporangium like the above. The spores scattered somewhat on 

 emerging. X 75- 



Fig. 7. Depauperate sporangia formed from filaments sprouting directly 

 from the spores in a large sporangium. Spores emerging from one filament. X 335. 

 Fig. 8. A sporangium similar to the above. X 335- 

 Fig. 9. An angular oogonium showing pits. X 335. 



Fig. 10. A typical oogonium with pits; an antheridium attached; the con- 

 tents of one egg filled in. X 335- 



Fig. II. An oogonium without pits except for the thin area where the 

 antheridium is attached. Two antheridial tubes shown. X 335- 



Fig. 12. Two oogonia, one intercalary, with diclinous antheridia. X 125. 



Fig. 13. Three oogonia. with antheridial filament of androgynous origin 

 X 125. 



