iiOTsoN. — cri/rtuK sttdiks or vrsm. 269 



Grandinia has \>vvn prodiu'cd on ^toss wood ciiltmi's of this Imlljil 

 and also on test-tube cultures of hran-agar of about 40 gm. of aj^ar to 

 the litre, by three or four of the ten cultures from ditt'erent sources 

 under cultivation. Preparatory to its formation, the mycelium ceases 

 to produce bulbils and forms a sort of incrustation, chalk-white in 

 color and becoming pustulate by the time the spores are formed, 

 Figure 1, Plate 6. The pustules on examination are found to be made 

 up of more or less thickly interwoven branching hyphae, which have 

 become enlarged and densely filled with granular material and oil 

 globules, the ultimate ramifications of which form the hymenium 

 (Figure 2, Plate 6). The basidia, which form a somewhat loose hy- 

 menium, each produce four spores, which are ellipsoidal to oblong in 

 shape, measuring about 4 X 8 yu. These spores were germinated in 

 Van Tieghem cells and the groAvth of the mycelium followed until the 

 fornuition of new bulbils, which were transferred to nutrient agar 

 m(>dia, where they produced mycelia and bull)ils like the original 

 culture. 



On tube cultures this fungus occasionally produces typical sclerotia, 

 which are formed by the massing together of many hyphal branches 

 which remain colorless for some time and thus are easily distinguished 

 from the bidbils. IVIoreover, they are larger, 400-500 n in diameter, 

 irregular in shape, somewhat darker in color at maturity, and com- 

 posed of smaller, compact cells. 



Grandinia also produces conidia of the Oidium-type on slender 

 clampless conidiophores, such as are described by Lyman ('07) for 

 Corticium alutaceum. 



CoRTicuM ALUTACEUM (Schrader) Bresadola. 



The bulbils of this species were obtained from Dr. Farlow, who found 

 them on a piece of rotten oak bark collected at Chocorua, N. H. It 

 was comparatively easy to get a pure culture, as the })u1bils are pro- 

 duced in large numl)crs and germinate rea<lily. This form has been 

 carefully compared with specimens of Corticium alutaceum ol)tained 

 from Dr. Lyman and they proved to be the same. The development 

 of the bulbil and the character of the conidia are practically identical 

 with those described for Grandinia and, as these have been well worked 

 out in pure cultures l)y Lyman ('07), it is not necessary to repeat the 

 results here, a detailed description of which may be obtained l)y con- 

 sulting his article, pp. KK) and 19(5. The mode of de\elopment of the 

 bulbils and the character of the conidia, however, ha\e been carefully 



