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. 

 (PJate Y. figs. 92-95.) 



Ustilago Cardui, Waldh. Produced on the florets ; mass 

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

 (*016 mm.) ; epispore with depressed reticulations, hyaline ; 

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



Ustilago Kuehniana, Wolff. Produced on the stems, 

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

 form of spots or striae ; spores globose or ovoid ('012 — 'OlGmm.) ; 

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

 Rumex acetosa and B. acetosella. 



Ustilago flosculorum, Er. Floret Smtjt ; produced 

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

 florets of Scabiosa arvensis. Not common. (Plate VI. figs. 

 123-125.) 



SOROSPORIUM, Rud. 



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

 are angular by compression ; brown and opaque in the 

 mass. 



Sorosporium Trientalis, Woron. (Tubercinia Trientalis, 

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

 containing a black mass of rather irregular depressed subglobose 

 spores, which are very opaque aud distinctly cellular, fly- 

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

 Trientalis Europaa. August and September. Scotland. (Plate III. 

 figs. 52, 53.) 



Sorosporium Scabies, Berk. (Tubercinia Scabies, B.). 

 Potato Smut ; spores globose, composed of minute cells form- 

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

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

 Common. (Plate III. fig. 54.) 



Thecaphora, Finff. 



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 ; 



