232 



E. M. CHATER MICEOSCOPIC FUNGI. 



these however are not contained in cups as are those of the 

 uEcidium. The goatbeard, the wood sanicle, the spurge, and 

 several other plants have also their cluster-cups. A variety with 

 white spores is found on the leaves of the wood anemone. I have 

 not yet however been so fortunate as to find it in this neighbour- 

 hood. 



The leaves of the hawthorn are visited with a fungus which 

 differs considerably in appearance from the ^cidmm, and is re- 

 ferred to a distinct genus called Roestelia. Instead of the margins 

 of the cups beuig divided into teeth, they are apparently torn into 

 shreds throughout their entire length, and the shreds themselves 

 are somewhat spirally twisted. This species is called the Roestelia 

 lacerata, and one locality where it may be found in abundance is 

 near the railway crossing in Watford Fields. Two other members 

 of this genus are mentioned by Mr. Cooke ; one in which the cups 

 are divided into shreds, the tips being united at the apex, which is 

 found on the leaves of the pear, and the other in which the cups 

 arc long and cylindrical, but not split as in the former. This is 

 found on the mountain ash, and is called Roestelia cornuta. 



Fig. 1. Wheat Mildew — Puccinia grmninis. 

 a. Straw with mature mildew. h. A tuft of the mature mildew mafrnified. 



c. A single spore. d. Spores of the " rust " or early stage of the mildew. 



When searching for specimens of the preceding we frequently 

 observe other appearances indicating the presence of fungi. For 

 instance, ia looking over the leaves of the wood anemone for the 

 whitc-spored ^cidium, we often come across leaves which are 

 covered with little brown pustules, and on examining those we 

 find that the epidermis has been ruptured at these parts, and 

 clusters of spores have forced themselves through the opening ; 

 these spores arc found to be stalked and constricted in the middle 

 so as nearly to form two divisions, and they are covered with 

 spines. We have found the Puccinia Anemoncn, which we may take 

 to represent a large genus, in which the spores are di\-ided into 



