a Lecture hy Professor Lindley. 



329 



a, A leaf with the iEc'idium becoming developed. h, A leaf bearing the .J^cfdium fully 



developed. c. Portion of a leaf with the ^cidium farther developed. d. Section of a 

 leaf, to show the fleshy thickening that accompanies the developement of the .Sci'dium. 

 ee. Seeds of the ^ci'dium : a seed is called a sporidium; in the plural, sporidia. //, Plants 

 of the jHoidium : each is called a peridium ; in the plural, peridia. 



Vol. VIII. p. 738., and p. 332. of the present volume]: it 

 first appears like mucus, but consists of a number of hairy 

 substances. These hairs, when magnified, appear like a 

 collection of granules of a bulbous shape, each containing a 

 number of balls connected by strings. These balls, though 

 so minute as to be scarcely perceptible by the eye, are yet 

 only receptacles for seed. This is a most destructive fungus : 

 it always seizes on the veins of the leaves, which afterwards 

 turn yellow, and fall off; the branches next wither, and in 

 two or three years a whole orchard is destroyed. Mr. 

 Knight, in 1832, suffered severely from this fungus, and 



