524 PETCH : 



spores under certain conditions in cultures media, the niycelium 

 wliich arises produces spores wliich are identical in form and 

 size and method of formation witli the spores of Thielavioysis ; 

 other observers have found this, and I have also secured the 

 same results. On making a few hurried trials for the pvu-poses 

 of this lecture, I was unable to repeat my previous results." 

 This was written in 1907, but no further particulars have been 

 published. 



Butler. 



Butler (13) cultivated Thielaviopsis paradoxa during the 

 course of investigations into the diseases of sugar cane in India. 

 He writes : " Two different kinds of spores are produced, 

 and the blackening wliich eventually is seen in the pith is due 

 to one of these. 



" The first spore form — the macroconidia— is formed within 

 the tissues. The spores are produced in chains extruded from 

 the tips of short lateral filaments, and are olive-green and 

 thick-walled. I have never seen macroconidia budded off 

 basipetally as described by Went, 



" The second spore form — the microconidia — is formed on 

 special lateral branches in chains hke the first, developed 

 within the filament (which is often hke a miniature cannon), 

 and expelled through an opening at its tip. The spores are 

 formed usually at the surface 



" It has been stated that this fungus, like Colletotrichum 

 falcatum, is only a form of TrichosphcBria saccliari. I have 

 kept pure cultures on cane slabs, starting from a single micro- 

 conidium, under observation for more than a year, without 

 obtaining anything but the macro- and micro-conidia. In 

 the opposite direction, out of many dozens of cultures of 

 Colletotrichum falcatum in the last two years I have never 

 obtained macro- or micro-conidia. This is in accordance 

 with the view now held in Java that both are independent 

 species." 



South. 



The question of the connection between Trichosphceria 

 sacchari and Thielaviopsis pa,radoxa has recently been discussed 

 by F. W. South (17), who favours the view that the former 



