140 
a gradual anatomy between the usual pean form upon 
a epic a edium, the microconidial form upon an unsuit- 
edium; and if iad be possible to ohiess every stage in 
this transition by growing the fungus upon a carefully graduated 
series of media. Experiments have shown that this is not the 
needs. Moreover, the formation of microconidia of constant size 
by pach jinetie of very specialised type upon a penicillioid form 
of conidiophore is a development perfectly distinct and abruptly 
aeperatad ‘hon the Polyactis fructification: there are no transi- 
tional forms of either spore or conidiophore. 
Numerous studies have been made* on the effect of various 
food conditions-upon spore formation i ytis cinere 
production, or accelerate or retard the formation of spores 
ne do inca hae pre like physiological repletion controls the 
quantity an ¢ the quality of conidial formation,t and cannot, 
therefore, be ne eae factor in microsporogeny 
name 
<ophor is also conditioned by their distance from the 
inal point of infection 
* See i in particular Behrens, J. : Denti: f. Bakt. ii. iv. 1898; Smith, R. E.: 
Bot. Gaz. xxxiii. 1902; Istvanfii, Gyde: (loc. a Benecke. W. in Lafar’s 
Hand. Tech. a he 2 1904-1907 ; Reidemeister Tr, : (loc. cit.); and Peltier, 
G. L.: Anns. t. Gard. xxiii, 
trytis, bu m rarely no in myots 
ce, S. R.: New Phyt. x, 1911; Istvanfii (loc, cit:) 
: on, these chlamydospores which are thic k-walled and or goats 
-give rise to the normal mycelium, and like the oidia siren: described, serv 
ito Gaea the fungus over a period of adverse condition 
