CYTOSPORINA 445 



Conidia flesh-colour in the mass, colourless singly, irregu- 

 larly oblong, 11-28 X 5 p. 



Spinach anthracnose {Colletotrichum spinaceae^ Ellis and 

 Hels.) is destructive to spinach in the United States, forming 

 spots on the leaves, which are at first minute and watery in 

 appearance. These gradually increase in size, become grey 

 and dry, and studded with numerous dark points, the fruit of 

 the fungus. The fungus emerges through the stomata. 



Conidia falcate or subfusoid, hyaline, ends subacute, 

 14-20x2-5-3 p. 



Halsted, N.Jersey Agric. Coll. Expt. Sta., Bull No. 70. 



Colletotrichum oligochaetum (Cav.) attacks the cotyledons, 

 leaves, stem, and fruit of melon, vegetable marrow, cucumbers, 

 and other cucurbitaceous plants. On the stem and leaves ill- 

 defined, yellowish spots appear ; on the fruit the disease spreads 

 rapidly, forming yellowish-white blotches which soon cause 

 the fruit to rot. On the dead patches, killed by the parasite, 

 minute, flesh-coloured spots appear ; these are the masses of 

 spores. When the plant is young when attacked, it is soon 

 killed ; older plants resist longer, but the fruit suffers. 



The fruit consists of minute, convex stromata covered with 

 cylindric basidia 10-12 //, long, each bearing a hyaline, 

 cylindric-ovate conidium ; the sterile hairs springing from the 

 stroma are few in number, 3-5, blackish-olive, with 1-2 septa. 



Cavara, Rev. My col. (1889), p. 191. 



Prillieux and Delacroix, Bull. Soc. Mycol.> 10, p. 162. 



CYTOSPOEINA (SACC.) 



Stroma wart-like, immersed, enclosing an irregular cavity, 

 the walls of which bear the conidia. Conidia filiform, hyaline, 

 continuous, usually curved, escaping through one or more 

 openings under the form of a coloured mucilaginous tendril. 



Gooseberry collar rot. According to Van Hall, Cytospor- 

 ina ribis (P. Magnus) attacks gooseberry bushes at the collar. 

 The cortex is first attacked, the mycelium gradually invading 

 the wood, when gumming takes place, and the supply of 

 water, etc., is cut off from the above-ground portion of the 

 bush, which consequently dies. After the fungus has been 



