for the Microscope. 45 



summer on the leaves and stems of the nettle. The 

 mouth of the cup is white and toothed ; the interior is 

 filled with yellow globose spores. (PI. V., fig. 7.) 



319. BUTTERCUP CLUSTER CUPS (/Ecidium Ranuncula- 

 ceanim. Similar cluster cups to the above are found on 

 the pilewort and other species of Ranunculus, and are 

 introduced here on account of no superior attractions, but 

 because this is the most common species, and the first to 

 make its appearance in early spring. 



320. WHITE-SPORED CLUSTER CUPS (sEtidium lenco- 

 spermuni). Are found on the leaves of the wood anemone, 

 generally in company with plants bearing the anemone 

 brand. The most important feature in this species is the 

 white spores. 



321. CLUSTER CUPS. Other cluster cups are found on 

 the leaves of the gooseberry, sanicle, coltsfoot, bedstraw, 

 violet, berberry, goatsbeard, buckthorn, daisy, primrose, 

 dock, and othej plants, all similar in their general 

 character. 



322. WHEAT BUNT (Tilletia caries). Fills the whole 

 interior of the grain of wheat with a fetid olive powder, 

 which, viewed with a quarter-inch objective, is found to 

 consist of globose, reticulated spores, mixed with branched 

 threads. 



323. RYE SMUT (Polycystis paralleld). Forms long 

 dark-coloured lines on the leaves and sheaths of rye, 

 consisting of many-celled spores. Interesting as the type 

 of the so-called ' cholera fungus.' (PI. V., fig. 20.) Allied 

 species are found on leaves of buttercup and anemone, 

 violets, and the meadow saffron. 



324. WHEAT RUST (Trichobasis rubigo-vcra). This is 

 the ' red rust ' of farmers, and is but too common on the 

 green leaves of growing corn, covering them with a rusty 

 powder, which consists of the globose spores, which burst 

 through the cuticle. 



325. COW-WHEAT RUST (Coleosponum Rhinantha- 

 ccarum}. Common in summer and autumn in bright 

 orange patches on leaves of the cow-wheat. The spores 

 are at first chained together, but ultimately disconnect 



