76 A. Barclay — A Descriptive List of the Uredinese [No. 2, 



ogamons plants, the exceptional one being on a grass. The most re- 

 markable of these is U. Gunninghamimius, presenting extremely ano- 

 malous characters. Another interesting species is that on StrchilantJieSf 

 as this host also bears an Aecidium which is, however, in no way related 

 to the teleutosporic fungus. 



a, HEMIUROMYCES, Schroter. 



1. Ueomtces Vossi^, nov. sp. 

 On Vossia speciosUy Benth. 



This grass is sometimes largely attacked by a species of JJromyces. 

 In August the leaves may be seen in commencing attack with the for- 

 mation of brown uredo pustules on the under leaf surface. These pus- 

 tules are small, oval or linear, and isolated. 



The uredospores are brownish, with sometimes a tinge of orange red, 

 very deciduous, falling off without any portion of stalk adhering. The 

 cell wall is uniform in thickness, and presents three or four pores, easily 

 seen by treatment with sulphuric acid. They measure on an average 

 24 X 19 2/x, varying from 25 X 22 to 23 x 17/li. The epispore is finely 

 warty. They germinate in water in the usual way, throwing out a 

 simple germ tube (fig. 1, PI. I.) 



Late in the year teleutosjpore pustules are formed. These are well 

 raised oval or linear dark brown sori, also hypophyllous. The spores 

 are very readily detached, coming off with a small portion of stalk 

 adhering. They do not germinate on maturing, but only after a period 

 of rest. These are thicker walled than the uredospores, and are espe- 

 cially thickened at the apex. They measure from 24 x 21 to 29 x 22/x, 

 w*hen fresh and examined in water. In spring they germinate very 

 readily in water (fig. 2, PI. I.) 



b. UROMYCOPSIS, Schrotcr. 



2. Uromyces Cunninghamianus, Barclay. 



On Jasminum grandiflorum, L. 



For a complete description of this parasite I must refer the reader 

 to a paper on its life history read at the Linnean Society on the 18th 

 December, 1889. The diagnostic characters of the species are as follows: 



Towards the end of August the leaves and smaller stems of the 

 host are largely attacked in the aecidial stage, and these are then much 

 hypertrophied. The peridia burst in a stellate fashion, allowing the 

 orange red aecidiospores to fall out. When these spores have been shed, 

 teleutospores are formed within the old peridia. These teleutospores are 



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