112 MICROSCOPIC FUNGI. 



remains of the ruptured epidermis. The spores are 

 globose and brown (plate VII. fig. 139). We have 

 not met with any other Uredine on the sorrel 

 leaves^ though one having a similar appearance 

 to the naked eye is not uncommon on several 

 species of dock. 



The fern rust {Uredo Filicum), which occurs on 

 the under surface of the fronds of two or three 

 species of ferns^ we have never met with^ and do not 

 think that it can be considered common. It has 

 been found in the A¥est of England^ on Cystopteris^ 

 and Sowerby collected it^ probably not very far 

 from London. 



One of the most common is the rust* found on 

 the leaves of the enchanter^s nightshade {Circcea 

 lutetiana), sometimes nearly covering the under sur- 

 face with its tawny snuff-coloured spores (plate VII. 

 fig. 135). The plant on which it is found is rather 

 locals but the rust {Uredo Girccece) seems to abound 

 wherever the plant on which it is parasitic flourishes. 

 Another fungus of a very similar external appear- 

 ance may be coUected^, more rarely^ from the leaves 

 of the same plant ; but in this the spores are two- 

 celled^ or divided by a transverse partition. This 

 fact is mentioned to guard against disappointment^ 

 should the spores be found to difl^er from the 

 characters of this section^ and to show that the 

 microscope is essential to the studj^ of fungi. The 

 spores of the true Uredo are globose and without 

 any partition (plate VII. fig. 136). 



