HORMODENDRON 465 



Some of the species are considered as representing the 

 conidial condition of the genus Hypomyces, the species of 

 which are parasitic on fungi. 



Mushroom mould (Gliodadium agaricinum, Cooke and 

 Massee) is a fungus which often attacks cultivated mushrooms, 

 causing the cap or pileus to break up into large scales and 

 arresting growth. The fungus forms whitish tufts that are at 

 first more or less gelatinous. 



The mycelium is branched, prostrate, giving off erect, fertile 

 conidiophores which bear whorls of branchlets, usually 

 arranged in fours, each branchlet bearing a terminal cluster 

 ofconidia. Conidia hyaline, subglobose, produced in chains, 

 at first held in a mass by mucilage, 4-6 /x diam. 



There is no cure for this disease, which usually spreads 

 rapidly when it once gains a hold ; it is generally introduced 

 along with the manure, and the only certain method of pre- 

 venting a recurrence of the disease is to remove all the 

 infected soil and replace by a fresh lot. 



CHAETOSTROMA (CORDA) 



Spore-bed black, bordered with black, rigid hairs. Conidia 

 ovoid or subfusiform, rarely subglobose, rarely in chains ; 

 conidiophores slender. 



Volutella also has the spore-bed surrounded by bristles, but 

 it is never black. Vermicularia again has black bristles, but a 

 perithecium more or less perfect is present. 



Olivia leaf blotch. (Chaetostroma cliviae, Oud.) forms large 

 yellow blotches of various form on living leaves of Clivia 

 nobiliS) beginning near the margin and extending inwards. 

 These blotches finally become studded with minute, black 

 spots, which under a pocket-lens are seen to be bounded by 

 a fringe of black hairs ; these spots bear the spores of the 

 fungus. 



Spore-beds shining black, finally with a central opening, 

 and surrounded by long, black, pointed, wavy hairs ; conidia 

 cylindrical, ends rounded, continuous, hyaline, 23-28 X 

 5-7 P- 



HOEMODENDEON (BERK.) 



Mycelium very scanty, mostly located in the tissue of the 

 host-plant; conidiophores erect, septate, slightly coloured; 



2G 



