81 



so coarse that four to five granules side by side would occupy the 

 width of the spore. The smallest spores seen measured 5*6 x 12'6/x, 

 but such were not common, and were not taken into account in the 

 above measurements. 



On being placed in water culture these spores germinated in the 

 same manner as those of the Gloeosporium of the apple and those of 

 the Colletotrichum of the Bean. There were two distinct methods of 

 germination : 



1. The spore became two-celled, and from one of the halves a 



short unicellular mycelium bore a dark-coloured secondary 

 spore of an ellipsoidal or sub-spherical form, with coarsely 

 granulated contents. 



2. The spore either without or with a primary division into two 



cells threw an unbranched mycelium, colourless, and composed 

 of cells eight to ten times as long as broad. 



Sometimes the same spore showed both sorts of germination, and 

 there were various intermediate stages. The secondary spore some- 

 times germinated soon after its formation. 



The granulation of spores of Gloeosporium presents a variety 

 of appearances according to the species to be sure, but also and 



X400 



Tig. 93. Spores of the ripe-rot of the Fig. 94. Ripe-rot spores of the passion-vine 



leaves of the passion- vine. leaves germinating and producing 



secondary spores. 



in particular according to the state of the spore itself. Some- 

 times the granulation is coarse and distinct, and sometimes it is 

 indistinct, and all these phases may be exhibited by the same species 

 in the course of a few hours, showing how uncertain a feature this is 



; and how misleading it may be to the systematist unless he is careful 

 to include in his characterisation all the various phases. The matter 



-composing the granules seems to disperse and collect according to the 

 vicissitudes of growth. At one time the granules may appear very 



distinct like the grains of rice in a pot of water about to be boiled, 

 and not long after they may appear indistinct and run together in 

 almost the same manner that the grains of rice might run together 



on being boiled. 



DISEASES OF THE WALNUT. 



HITHERTO the walnut has been grown in this State only on a small scale, 

 ; and its diseases have consequently had comparatively little attention. 

 Occasionally the diseases have received some little notice and I will 

 .record here the few scattered notes I have made upon their nature. 

 36567 F 



