TWO NEW SPECIES OF WATER MOLDS 
(With Plates 146-148, Containing 38 Figures) 
W. C. Coker 
Since the publication of my third new species of Achlya 1 in 
1912 a continued study of the occurrence and periodicity of the 
Saprolegniaceae in Chapel Hill, has discovered two other new 
and remarkable forms of that family. 
The first of these was met with as long ago as March, 1911, and 
it has been found twenty-five times since. Pure cultures on various 
media, generally from a single spore, have been kept under obser- 
vation for over three years. So puzzling is the form that after 
preparing a description of it in 1912 it was decided to continue 
collections and experiments for another year before publication. 
The difficulty arises from the fact that our plant combines in a 
most confusing manner the characters of both Achlya and Sapro - 
legnia , and a rigid interpretation of these genera as at present 
defined would exclude it from both. As the formation of a new 
genus in such a case could not simplify matters, and as the genera 
Achlya and Saprolegnia are sufficiently distinct except for this 
narrow point of contact, it would seem much better to retain them 
and admit the variations. The case is not unlike the situation in 
the two genera Puccinia and Uromyces, where forms are known 
that combine the characters of both. As the proliferation of the 
sporangia is usually of the Achlya type I have decided to refer 
this form to the genus Achlya and to define it as follows: 
Achlya paradoxa sp. nov. 
Plant delicate ; hyphae straight, slender, and little branched, the 
larger threads having a diameter of about 37 /x ; many much 
smaller, the average being about 10-15 sporangia plentiful 
at all stages, narrowly club-shaped ’and largest at the distal end 
which is about 55 /x in diameter, rounded, and furnished with 
a distinct but short papilla ; secondary sporangia formed usually 
iMycologia4: 325. 1912. 
285 
