202 
MILDEWS, RUSTS AND SMUTS 
spots on the leaves. Coni^ial stage forming white, spread¬ 
ing patches on the under surface of the leaves. Conidio- 
phores erect, slender. 
THECAPHORA, Fingerh. 
Spore-balls formed of several firmly-adherent cells, spore¬ 
forming hyphae not gelatinising; promycelium slender, 
sometimes branched ; promycelium spores slender, spindle- 
shaped, produced singly at the tip of the promycelium. 
Resembling Sorosporium in having all the spores forming 
the spore-balls fertile, but in the present genus the com¬ 
ponent spores are comparatively large, few in number, and 
firmly adherent to each other, the free side of each being 
convex, the sides in contact, flat, whereas in Sorosporium 
the spores forming a spore-ball are numerous, globose, and 
small, and fall easily apart. 
Thecaphora hyalina, Fingerh. ; Plowr., Ured., p. 200. 
Spore-masses produced in the seeds, pale reddish-brown, 
coarsely powdery ; spore-balls of 3—10 spores, spores glo¬ 
bose, 12^—-15 p, pale brown, free surface of each densely and 
minutely warted, promycelium branched, promycelium 
spores unknown. 
vSyn. Uredo seminis-convolvuli, Desm. 
Ustilago capsularum, Fr. 
Sorosporium hyalinum, Wint. 
In the fruit of Convolvulus sepium, C. arvensis, C. sol- 
danella. 
Thecaphora trailii, Cooke ; Plowr., Ured., p. 296. 
Spore-balls forming a purplish-brown powdery mass in 
the inflorescence ; 2—4 spores in a spore-ball, spores sub- 
globose or more or less compressed at the points of contact, 
wall with a very small, delicate network, 12—16 p. 
On the inflorescence of Carduus heterophyllus. 
Cooke says the fungus is pulverulent, having very much 
the habit of Ustilago cardui, but differs in being a true 
Thecaphora, and in the epispore being verrucose and not 
reticulate. An examination of the type specimens shows 
that the epispore is reticulated or covered with a network, 
and not warted. The nature of the promycelium can 
alone settle its true position. 
CINTRACTIA, Cornu 
Spores adhering in masses forming spore-balls, becoming 
free at maturity ; germination ? 
