USTILAGO. 299 



Ust. Vaillantii Tul.^ appears in the anthers and ovaries of 

 Gagea, Scilla, Muscari, etc. The perianth of diseased flowers 

 remains, but is somewhat enlarged. The ovaries and anthers 

 become filled with spores ; the latter organs are, however, fully 

 developed and may even contain pollen-grains mixed with spores. 

 According to Brefeld, the spores germinate easily in water and in 

 nutritive solution. A promycelium is formed which, after detach- 

 ment from the spore, becomes three-celled and develops conidia. 

 These sprout for some time, then produce three-celled promycelia. 



Ust. omithogali (Schm. et Kze) forms leaf-swellings on Ornithogalum and 

 Oagea. 



Ust. tulipae (Heufl.) produces swellings on the leaves of the tulip. 

 Ust. plumbea Eostr. occiirs on leaves of Arum maculatum in Denmark. 

 Ust. ficuum Eeich. In the fruits of Ficus Carica in Asia Minor. 

 Ust. Trabutiana Sacc. In berries of Dracaena Draco in Algeria. 



Ust. Vrieseana Vuill.^ In the Botanic Garden at Amster- 

 dam, the roots of several species of Eucalyptus exhibited woody 

 tumours from which proceeded outgrowths resembling " witches' 

 brooms." These contained the mycelium of an Ustilago which 

 produced spores in the cortical tissues. 



Ust- (?) adoxae Bref. On Adoxa^ mosckatelUna in cells of the subterranean 

 stem. The spores produced only simple filaments without conidia. 

 Ust. Lagerheimii Bref. On Rumea from Quito. 

 Ust. Schweinfurthiana Thiim. On Imperata cylindrica from Cairo. 

 Ust. boutelouae-humilis Bref. On Bouteloua humilis from Quito. 

 Ust. Ulei Henn. On Ghloris. 

 Ust. spinificis Ludw. On Spinifex hirsuta from Adelaide, Australia. 



Ust. Treubii Solms.^ This Javanese fungus and the galls 

 produced by it deserve a somewhat lengthened notice on account 

 of their general biological interest. It causes a hypertrophy on 

 Polygonum chinense in Java, which further exemplifies the 

 phenomena already noticed in connection with Gaeoma deformans 

 on Thujopsis (p. 30). 



The stems at attacked places show strong hypertrophy and 

 great change in their anatomical structure. Solms designates 

 the thickenings, in common with those caused by Gaeoma. 



'Tulasne, Ann. d. science natur., Ser. iii., Vol. vii., 1847, with plates of Mitscari. 

 Worth G. Smith {Gardener's Chronicle, XV., 1894, p. 463), gives a figure 

 and note on occurrence of this smut in Britain. (Edit.) 



^Vuillemin, Compt. rend., 1894. 



5 Solms, Annal. du jar din botan. de Buitenzorcj, Vol. vi., 1886-87, p. 79. 



