1890.] occurring in the NeighhourJwod of Simla. 83 



d. PHRAGMIDIUM (INCOMPLETE.) 



4. Phragmidium incompletum, nov. sp. 



On Buhus paniculatus, Smith. 



In March I found the leaves of this host bearing the uredospores 

 (aecidiospores ?) of some species of Phragviidium probably, which I 

 have not been able to determine, never having seen the teleutospores. 

 It was found in a deep valley near Simla. The nerves of the leaves 

 were mostly attacked, and in such places they were distinctly hyper- 

 trophied : a few pustules were also found, however, upon the blade 

 proper. The pustules were entirely hypophyllous, but their places were 

 indicated on the upper surfaces of the leaves by reddish brown spots 

 of discolouration. The pustules were light yellow and small. 



The spores are yellow, round to oval, beset with prominent spines, 

 and measured when fresh 34 — 30 x 25 — 23/x,. There are no para- 

 physes. They germinated readily in water, throwing out single long 

 unbranched straight tubes, mostly aerial. 



Remarks. — In this incomplete stage it is impossible to identify it 

 with any known species. 



MELAMPSORA AND COLEOSPORIUM. 



I have found considerable difficulty in separating certain Uredines 

 into Melamjjsora and Coleosporiicm, mainly because I have not been able 

 to observe the germination of the teleutospores sufficiently accurately. 

 Apart from this, however, the morphological characters of each group 

 are sufficiently definitely set forth in Winter's work* to enable one to 

 separate them with confidence, were these characters maintained in each 

 species. For example, it is stated that in the genus Melampsora the 

 teleutospores are single-celled, or vertically divided, rarely horizontally, 

 and that the uredospores are borne singly on basidia ; whilst in the genus 

 Coleosporium the teleutospores consist of several, usually four, super- 

 imposed cells, and the uredospores are in short chains. But in the case 

 of the Simla forms these characters are not separately maintained, for 

 whilst in some species the teleutospore forms conform with the descrip- 

 tion of Melampsora spores the related uredospore forms resemble Cole- 

 osporium forms. This is the case, for example, with the parasites on 

 Hypericum and Leptode7"inis. In these species the teleutosporic forms 

 are distinctly of the Melampsora type, whilst the uredos being in well 

 defined chains, resemble Coleosporium. As the teleutospores are the 

 more important I have considered these forms species of Melampsora, 



* " Die Pilze Deutschlfvnds," &o. 

 12 



