300 British Uj-edinea^ and Ustilaginecr. 



PROTOMYCES. Unger. 



Mycelium intercellular, parasitic in the tissues of living plants. 

 Spores formed in the continuity of the mycelial hyph^e, inside 

 the tissues of the living host-plant, causing indurated swellings 

 on the host-plant. Germination by the development of numerous 

 minute sporidia inside the resting spores. (Plate VIII. figs. 14-20.) 



Protomyces macrosporus. Unger. 



Tumefactions at first translucent, pale yellow, then white, at 

 length brownish, 1-4 mm. long, 2 mm. wide and thick, firm, 

 at first closed, then open. Spores irregularly spherical or 

 elliptical, 40-80 X 35-60/x. Epispore as much as 5ju, thick, 

 pale yellow, contents colourless, sporidia cylindrical, 2-2*2 x i/la. 



SynoTiyj?!. 

 Protomyces macrosporus, Unger. Schrot., loc. cit, p. 259. Cooke, 

 "Micro. Fungi," 4th edit., p. 227. 



On ^gopodiiun podagraria, Helosciadinm iiodifioriim, Heracleum 

 sphondylium, Angelica sylvestris, Atithrisciis sylvestris, CEnanf/ie 

 crocata. 



May to October. 



Protomyces rhizobiiis. Trail. 



Spores in the cortex of the roots in groups of from two to eight, 

 spherical, nearly smooth, with very thick walls, pale brown 

 or nearly colourless, 30-33/x in diameter. 



Synonym. 

 Protomyces 7-hizobms. Trail, Scott. Nat., January, 18S4, p. 125. 



On the roots oi Poa annua. Old Aberdeen, May, 1883. 



Protomyces pachydermus. Thiim. 



Forming elongate or confluent swellings in the leaf-stalk or mid- 

 rib of the leaves. Spores scattered, intercellular, subglobose 

 or elliptical, thick-walled. Epispore smooth, pale brown, 

 15-20/A in diameter. 



