300 British Uvredinee and Ustilaginee. 
PROTOMYCES. Unger. 
Mycelium intercellular, parasitic in the tissues of living plants. 
Spores formed in the continuity of the mycelial hyphe, 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 35-60n, Epispore as much as sp thick, 
pale yellow, contents colourless, sporidia cylindrical, 2-2°2 X 1p. 
Synonym, 
Protomyces macrosporus, Unger. Schrot., loc. cit., p. 259. Cooke, 
“ Micro. Fungi,” 4th edit., p. 227. 
On Z£gopodium podagraria, Helosciadium nodiflorum, Heracleum 
Sphondylium, Angelica sylvestris, Anthriscus sylvestris, Ginanthe 
crocata, 
May to October. 
Protomyces rhizobius. 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 in diameter. 
Synonym. 
Protomyces rhizobius. Trail, Scott, Nat., January, 1884, p. 125. 
On the roots of 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 in diameter. 
