248 
Dawson.—On the Biology 
elongation of the apex of a hypha, a marked constriction of 
the extreme end is noticeable, forming a kind of bud, and 
after considerable elongation of the bud-like protuberance 
a septum forms at the point of constriction (Fig. 13 a-h ). 
After twenty-four hours’ growth frequent lateral anastomoses 
are seen in the young mycelium (Fig. 15 a, d), also the exudation 
of glistening drops—possibly containing a ferment-like sub¬ 
stance—from the tips of the hyphae. 
The Conidia form germ-tubes from either end or from both 
ends simultaneously; occasionally three or four germ-tubes 
may arise from one spore (Figs. 11 and 12). The mycelium 
produced consists of branched and septate hyphae, at first 
very slender, but gradually becoming stronger, and eventu¬ 
ally indistinguishable from the mycelium grown from an 
ascospore 1 . 
If a young mycelium (grown either from a conidium or 
an ascospore) be transferred to a tube of horse-dung, extract in 
gelatine or agar, in about three days a beautiful stellate growth 
is seen, consisting of radiating and glistening silky hyphae; 
after twelve to fourteen days central heaped-up masses 
become noticeable, and in three weeks’ time minute pillar-like 
structures, standing up from the surface in the manner shown 
in Fig. 3 a. A large number of young stromata of this kind 
have been cultivated, and from these have grown in great abun¬ 
dance stromata of unusually large size, frequently branched, 
and having the various forms found in nature, also bearing 
large numbers of conidia on the upper parts. Thus far, only 
early stages in the formation of perithecia have been found; 
further reference will be made to these later. 
In Figures 3 and 4, sketches of some of these stromata, 
made at different stages in their development, are shown. 
These cultures have brought to notice several interesting 
points in the biology of the Fungus. From an examination 
of a very young stage (see Fig. 3 a) we find that this consists 
entirely of vegetative hyphae, densely interwoven, and rising 
1 Early stages in the germination of ascospores and conidia were figured by 
Tulasne, loc. cit., tab. III. 
