396 Horne and Williamson .— The Morphology and 
Optimum growth in all the culture media employed was obtained at 
20° C., with very little growth at 30° C. On synthetic nutrient agar no 
growth occurred at 25°C. or 30° C. 
The production ofconidia and the colour of the macrospores are affected 
by temperature. At 30° C. no conidia were observed and the majority of 
the macrospores were hyaline, whilst at 20° and 25 0 C. numerous conidia and 
brown macrospores were formed. 
2. Eidamia viridescens , n. sp. 
This fungus was isolated from rotting apples and single spore cultures 
obtained. The mycelium consists of colourless septate branched hyphae, 
which may be as much as 7 fi to 11 /x in width. The character of the mycelium 
varies according to the medium used. It may have a gelatinous consistency, 
as when the fungus is grown in 2 per cent, peptone, neutralized potato ex¬ 
tract, and potato extract with hydrochloric acid in N/iooor N/1000 concen¬ 
trations. The mycelium is filmy in appearance in 1 per cent, concentrations of 
wheaten starch in agar and in potato 
extract agar, containing various con¬ 
centrations of malic, citric, tartaric, 
gallic, tannic, or hydrochloric acid or 
in solutions of various sugars. A floc- 
culent woolly appearance occurs in 
potato extract solutions containing 
gallic or malic acid in 1-5 or 2 per 
cent, concentrations. 
Two kinds of spores are pro¬ 
duced, hyaline macrospores and 
conidia. The macrospores are thick- 
walled, circular, or ovoid, varying in 
size from Hju,x8/a, 13 /x x 9 /x,to 12 
in diameter. They are borne singly 
Fig. 4. E. viridescens. Terminal and at the end of lateral branches or 
mtercahry macrospores on potato extract agar at may be inter calary (Fig. 4). These 
v * Oy * 
are developed in from 3 to 8 days 
after inoculation according to the medium employed. Macrospores were 
found in all the culture media employed except prune agar at 20° C. 
and synthetic nutrient agar at 20° C., though a few were present on synthetic 
nutrient agar at 25 0 C. after eight days’ growth. 
The conidiophores are, as a rule, branched structures with the sterig- 
mata borne either in groups or singly along the branches (Figs. 5 and 6). 
The sterigmata resemble those of E. acremonioides in structure, being broad 
