398 PLANT DISEASES 



becoming pale, spores cylindric-ellipsoid (sausage-shaped), 

 slightly curved, 14-16x6-7 /x. 



Hypochnus, Fries. Resupinate, membranaceous, texture 

 loose, homogeneous, floccose, collapsing; hyphae filiform, 

 branched and anastomosing, the tips of the uppermost 

 branches becoming changed into basidia bearing 2-4-6 

 sterigmata ; spores elliptical or globose, hyaline, or coloured ; 

 epispore smooth or rough. 



Hypochnus cucumeris, Frank, Hedw., 1883, p. 127. 

 Forming grey or greyish-brown membranaceo-fibrillose 

 patches on the lower part of the stem of the host, up to 

 i mm. across ; basidia elongated, bearing four sterigmata 

 at the apex ; spores ovoid, hyaline. 



Hypochnus solani, Prill, and Del., Bull. Soc. Myc., 1891, 

 p. 220, fig. Membrane effused, thin, slightly granular, 

 cracked when dry, scarcely adhering to the cuticle, greyish 

 white, internally brownish ; basidia globoso-ovate, apex 

 rounded ; spores hyaline, ovate, base apiculate, 10x6 [*.. 



Exobasidium, Woronin.- Effused, incrusting, waxy ; 

 basidia crowded, cylindric-clavate, bearing a variable 

 number of spores at the apex. 



Typically parasitic on living plants, which are deformed 

 by the fungus. 



Exobasidium rhododendri, Cramer, in Rabenh. Fung. 

 Eur., No. 1910. Forming gall-like swellings on the leaves, 

 at first pale-green, becoming more or less tinged red; 

 basidia stout, number of sterigmata variable, often four; 

 spores hyaline, smooth, broadly elliptical, 8-10x6-7 p.. 



Exobasidium vexans, Massee, Kew Bulletin, 1898, p. 

 in, figs. 6-10. Forming large blisters on the leaves, 



