1896. ] Cultures of Exobasidia. 103 
in number, retain their normal size, but the others are con- 
siderably enlarged. It is to the excessively rapid growth of 
the cells on the periphery and almost entire quiescence of 
those in the interior that the hollow character of the gall is 
ue. 
The hyphe of the parasite are mainly located in the wall of 
the distortion but some are seen among the parenchyma cells 
which cling around the vascular bundles. They are very fine, 
not more than 1.5% in diameter, and are much branched, but 
never seem actually to enter the cells. The basidia which 
arise from them push their way up in the usual fashion be- 
tween the cells of the epidermis. They arise as outgrowths 
directly from the hyphe, with which their connection may be 
easily demonstrated (figs. 7, 8, 9). In each basidium a well 
defined nucleus is seen and its division and the subsequent 
formation of the spores were not seen to differ at all from that 
described by Rosen? in other Basidiomycetes. For further 
details one should consult this article and also the papers by 
Wager. Of the general course of the formation of the 
spores Woronin has given a description, which corresponds 
to the figures here shown (figs. 2-6). As in other Exobasidia 
the number of spores on a single basidium is not constant, 
Varying usually from four to seven, while in rare cases two 
were observed. 
As far as the writer has seen the spores do not differ ma- 
terially from those of Exobasidium Vaccinii and are subject 
9 as much variation. They have the same elongate, some- 
times slightly curved shape and finely granular contents. 
© size as measured in the specimens examined is scarcely 
More than that of the spores of E. Vaccinii, being about 14- 
ma by 3é wide. This does not correspond, it is true, 
ne € published descriptions, which give the size as 22-254 
tk — the spores measured were mature there can be no 
sms - “3 many of them had become divided after the sient 
Exob the ripe spores of Exobasidia. In the specimens 0 
Wik pi Andromede in Ellis* the longest spore obtained 
Tn a but ‘the majority were of the size already given. —_ 
hacia, connection attention may be called to a misprint in 
os Sylloge Fungorum® and in Winter's Pilze® where 
*Cohn’s Beitr : iteilaik: Sgetocy Rie, 
3 €6: 259. 
wwe Botany 71 489, 1893.— 8: 321. 1894. 
> 66, 
‘ ae 
Rabh, Krypt. Flora 14: 322. 
