390 JOURNAL OF THE EOYAL HORTICULTURAL SOCIETY. 



Spiny Tulip Brand. 



Puccinia Prostii (Moug.) 



This is the second, and older species, which is known on Tulip leaves 

 in France and Italy. This also has neither affiliated cluster-cups nor 

 uredo. 



The pustules are oblong, convex, brown on both surfaces of the leaves, 

 either scattered or rather crowded, at length ruptured. The teleutospores 

 are ellipsoid and, of course, uniseptate (60-66x34-36 ^), considerably 

 larger than in the preceding, everywhere covered with long colourless 

 acute spines. The general colour of the epispore cinnamon brown, with 

 a hyaline pedicel or footstalk. 



Sacc. Syll. vii. 2580. 



ObnithogaIiUM Brand. 



Uromyces OmithogaU (Wallr.), PI. V. fig. 83. 



The species of Oruithogalum, Gagea, and Erythronium seem to be 

 specially favoured in this country by the absence of parasites, which are 

 sufficiently common abroad, to the extent of some eighteen or twenty 

 species. 



The leaves of Oruithogalum and Gagea are alike subject to the above 

 brand, which is only known in the teleutospore form. The pustules are 

 elliptic and bullate, mostly scattered, soon splitting and discharging the 

 powdery nearly black spores. 



The teleutospores are ovate, or pear-shaped (26-50 x 17-26 

 narrowed into the pedicel at the base and rounded above, with a minute 

 hyaline wart-like apiculus. The surface is smooth, rarely otherwise, and 

 of a pale or chestnut brown colour. 



It occurs in France, Germany, Hungary, and Portugal. 



Sacc. Syll vii. 2015 ; Ploicr. Br. Ured. 142 ; Grevillea, vii. 138. 



A corresponding species (Uromyces ErytJironii) is found on Ery- 

 thronium and other Liliaceous plants nearly throughout Europe and in the 

 United States. (See fig. 100 on opposite page.) 



Puce in in LtUacearum occurs in Britain on Oruithogalum umbcllatnm, 

 and another species, Puccinia Kalchbreuiicriana, at the Cape of Good 

 Hope, and Puccinia Lojkuiuna in Italy, the Tyrol, and Hungary, all upon 

 Oruithogalum. 



Ornithogalum Black Mould. 

 Hctcrosporium OmithogaU (Klot.), PI. V. fig. 85. 

 In the majority of instances the black moulds are truly regarded as 

 saprophytic, living upon and at the expense of dead vegetable matter ; 

 but there are decided exceptions to this rule in entire genera, such as 

 Gercospora and the present Heterosporiwm, which seem to be entirely 

 parasitic. The latter genus was named by Klotsch more than half a 

 century ago, but was not clearly defined until 1877 with this as the typical 

 species. 



The leaves become spotted with sooty-looking minutely velvety 



