310 A. E. Lechmere. 
Summary of a Classification of the Saprolegniace/e. 
(Based on the asexual forms of reproduction.) 
Zoospores encyst after swarming from sporocyst - - A. 
,, „ at mouth of sporocyst - - - B. 
,, „ within the sporocyst - - - - C. 
(a). New sporocyst grows up inside the 
old one ; diplanetic 
( Several | . c a i 
( Oospores. ) L ^olegnta. 
! Oospore, j 2 ‘ ^ptolcgnia. 
A. 
(b). Sporocysts, elongated 
tiple ; diplanetic 
and 
mul- 
(c). New sporocysts arise in cymose 
order; only the second motile 
' form present 
3. Leptomitus. 
4. Pythiopsis. 
(a). Sporocysts arise in cymose order 
B. 4 
(b.) 
New sporocyst grows up inside the 
old one. Zoospores amoeboid on 
first discharge 
. (a). Wall of sporocyst breaks down after 
encystment, liberating a mass of 
encysted spores ... 
( b ) . Wall of sporocyst remains after 
encystment. Zoospores break 
through the wall - 
( c ) . Wall of sporocyst remains and 
spores germinate directly within 
it. No discharge, no motile 
stage ..... 
5. Adilya. 
6. Aphanomyces 
7. Thraustotheca 
8. Dictyuchus. 
9. Aplanes. 
Formation of the Normal Sporocyst. 
Before proceeding to describe the various divergences from 
normal sporocyst structure, seen in the species under observa¬ 
tion, an account is given of the normal method of formation and 
discharge of a sporocyst based chiefly upon the work of Hartog 
and Humphrey, as their account substantially agrees with my own 
observation. 
An ordinary vegetative hypha consists of a single cell-wall with 
a parietal lining of granular protoplasm containing numerous 
microsomes, and some cellulin corpuscles, enclosing a central 
vacuole filled with sap. 
The first sign of formation of a sporocyst is the arrest of the 
apical growth of the hypha. The protoplasm continues to flow 
