398 Horne and Williamson.—The Morphology and 
Fragmentation and the production of swollen cells occurred in N/100 
and N/1000 HC 1 , in solutions of sugars, and in soluble pectin. Th£ optimum 
temperature for growth lies between 20° and 25 0 C., no growth being obtained 
at 30° C. 
Bramley's seedling apples were inoculated with E. viridescens kept at 
20° C. and examined after eight days. Very little surface growth was 
visible, but definite growth into the apple occurred, showing that the fungus 
is capable of parasitizing the living cell. 
3. Eidamia catenulata , n. sp. 
This fungus was isolated from a seasoned specimen of the heartwood of 
Quercus robar. Single spore cultures were obtained and all sub-cultures 
made from them. 
The mycelium consists of colourless septate branched hyphae varying 
from 3 m to it //in width. These hyphae are usually thin-walled, but thick- 
walled hyphae do occur when the fungus is grown on certain media, such as 
potato glucose agar or prune agar. The mycelium usually forms a close 
thin felt, though it may be filmy, when grown on gallic or citric acid agar 
and sugars such as sucrose, lactose, and maltose; or flocculent, when grown 
on 1-5 and 2 per cent, tannic or gallic acid agar, and potato extract with 
various concentrations of malic acid ; or of a sub-leathery consistency, when 
grown on 2 per cent, peptone with 4 per cent, glucose. In potato extract 
containing N/10, N/100, or N/ioco concentrations of HC 1 the hyphae show 
many swollen bulbous cells, some of which produce sterigmata and conidia 
(Fig- 7 )- 
Two kinds of spores are produced, hyaline macrospores and conidia. 
The macrospores are borne directly on the hyphae or at the end of a short 
branch, or may be intercalary. They often occur in pairs and are thick- 
walled, round, or pear-shaped, with well-marked contents (Fig. 8). They 
vary in size from 7-5 // x 8-5 // to 14 // x 10 //, or may be even 18 // in diameter. 
These hyaline spores occur on all the culture media employed when kept 
at 20° or 25 0 C.: they are less numerous or absent at 30° C. 
The conidia are borne in long chains (containing up to 100 spores in 
each) on sterigmata arising directly from an aerial hypha, or on short 
branches from such a hypha, or on a more complicated conidiophore where 
a branch from the mycelium has again branched several times, forming one 
to several sterigmata on each branch (Fig. 9). Occasionally, several sterig¬ 
mata arise from a slightly swollen short branch (Fig. 10), and sometimes 
a Penicillmm type of conidiophore may occur (Fig. 11). The sterigmata 
are slender, slightly swollen at the base, and vary in size from 8// to 164 
in length and 1 // to 2-5 // in width at the base. 
The conidia are yellow in colour, narrow to broadly elliptical, pointed 
