PTTCCINIA. 



303 



For surface view of gill, mount a piece of a gill on 

 a dry slide, and note (1) the basidia with rounded ends, 

 bearing two spores each ; (2) the bare rounded ends of the 

 young basidia which have not yet formed spores and 



TRAMA .SUB-HYMENIUM 



N .'' 



x-HYMENIUM 



CONIDIUM 



, STERIGMA 

 '' .BASIDIUM 



PARAPHYSIS 



Fig. 63. AOARICUS. Section across one of the Gills. The diagram to the right 

 represents the Hynienium and Sub-hymenium more highly magnified. (Four 

 Conidia should have been shown on each Baaidium.) 



of the old basidia from which the spores have fallen 



(3) the paraphyses, narrower than the mature basidia ; 



(4) the brown coloured spores, the basidia and para- 

 physes being colourless like the general tissue of the 

 gill. 



PTTCCINIA GTBAMINIS. 



436. Uredospores on Wheat Plant. Examine 

 "rusted" plants of Wheat in summer, showing the 

 reddish orange elongated spots on the leaves and stems. 

 With a lens note that these spots are cracks or slits 

 from which an orange yellow powder is shed or can easily 

 be scraped. 



