16 HUMPHREY 
injury. ‘The infection spreads from plant to plant quite rapidly. 
In a dinner-plate full of material, at first the majority of plants 
examined were unaccompanied by fungus, but within three 
weeks, on one side of the plate all the plants were turning brown; 
on examining these they were found to be infected. The fun- 
gus seems usually to make its attack through the ventral side 
of the thallus, though occasionally a plant would be found with 
hyphez on both sides. Microtome sections failed to reveal any 
vesicular structures within the host. 
Aneura, being naturally less compact and vigorous than such 
forms as Fegatalla or Lunularza, furnishes a poorer field for a 
parasitic fungus and seems less able to cope with the fungus. 
This, however, may be partly due to greater vigor of the par- 
asite. It must also be noted that infected plants behave dif- 
ferently under varying conditions. <Aneura multifida major 
as we find it here is semi-aquatic as to habitat and when grow- 
ing under perfectly normal conditions may be considerably in- 
fected without showing any effect other than becoming yellow- 
ish green in color. If, however, these same plants are brought 
into the laboratory, even though well supplied with moisture, 
under a bell-jar they become brown in color finally dying, 
while uninfected plants seem to thrive quite as well as when 
growing out-of-doors under normal conditions. Plants grow- 
ing along streams, though receiving little less than the required 
amount of water, if infected, seem less able to throw off the 
effects of the fungus than plants growing under perfectly 
normal conditions of moisture, light, etc. 
Aside from the fungi found in association with Fossombronza, 
Fimbriaria and Aneura, the writer has had occasion to study 
infected material of Anthoceros pearsoni and Porella bolanderz. 
In habit of growth the fungus associated with Axthoceros is 
very much like that infecting Azeura though none of the 
material examined showed any structures suggestive of fruiting 
organs other than conidia which were being formed in consid- 
erable numbers by abstriction along the external hyphe. They 
branch freely and are seen to anastomose not at single points 
here and there but continuously for some length, both hyphe 
being rather minutely septate along the length of contact. The 
