APPENDIX. 231 



produced within the receptacles ; spores ovate, minute, reticu- 

 lated, violet-brown, nearly black, very profuse, filling the recep- 

 tacle. — On the receptacles of Goatsbeard. June, July. Common. 

 (Plate V. figs. 92-95.) 



Ustilago Cardui, Waldh. Produced on khe florets ; mass 

 of spores clay-coJoured ; spores globose, rarely rounded oval 

 ('016 mm.) ; epispore with depressed reticulatioas, hyaline ; 

 areolae in the form of facettes. — On the flowers of Thistles. 



Ustilago Kuehniana, WoiS. Produced on the stems, 

 flowers, and leaves ; mass of spores dark rusty-violet, in the 

 form of spots or stria? ; spores globose or ovoid ("012 — 'OlBmra.) ; 

 enispore dark reddish-violet, much reticulated. — On Sorrel ; 

 Ruraex acetosa and R. acetosella. 



Ustilago flosculorum, Pr. Flouet Smut ; produced 

 within the florets; spores minute, purplish-brown. — On the 

 florets of Scabiosa arvensis. IS'ot common, (Plate VI. figs. 

 123-125.) 



SoROSPomuM, Rud. 



Spores in dense masses of a hundred spores, or more, which 

 are angular by compression ; brown and opaque in the 

 mass. 



Sorosporium Trientalis, A'\'oron, {Tubercinia TrientaliSy 

 B. and Br.). Trientalis Smut ; son two lines broad, bullate, 

 containing a black mass of rather irregular depressed subglobose 

 spores, which are very opaque and distinctly cellular. fly- 

 phasnia white, branched, creeping, delicate. — On leaves of 

 Trientalis Europcpa. August and September. Scotland, (i'latelll. 

 figs. 52, 53.) 



Sorosporium Scabies, Berk. {Tubercinia Scabies, V>.). 

 Potato ^mut ; spores globose, composed of minute cells form- 

 ing together a hollow globe with one or more lacurse, generally 

 attached laterally bv a slender thread, olive. On Potatoes. 

 Common. (Plate 111. tig. 54.) 



Thecaphoea, Fitig. 



Masses composed of a less number of larger spores than in the 

 preceding, with the outer surface rounded, rarely smooth. 



Thecaphora hyalina, Ping. Developed in the capsules ; 



