a Lecture In/ Professor Lindley. 



327 



called Botrytis. Its name signifies a 

 bunch of grapes ; and it is thus called 

 from a fancied resemblance between 

 that fruit and its clusters of little 

 globular seeds and seed-vessels. The 

 bean and pea have a superficial mil- 

 dew, [/redo jPabse Pe7s. {fg. 89.), 

 which spreads along their leaves, like white roots curiously 

 interlaced. From these roots spring a 

 number of branch-like shoots, each bear- 

 ing a ball-like head, or brown berry, 

 which, when ripe, bursts, and discharges 

 seed. 



The second class of fungi, viz. those 

 which spring from the interior of leaves 

 and stems, are by far the most fatal. These 

 fungi generally appear in a sort of bag 

 or case, which is supposed- to be formed of the cuticle of 

 the affected leaf. The oak is attacked by a species of 

 fungus, ^cidium, different varieties of which are found 

 on many kinds of forest trees. The ^cidium Pini {Jig. 90.), 



found on pine trees, has, when magnified, the appearance 

 of a number of nine-pins. When ripe, the cuticle which 

 covers the fungus bursts, and emits a powder of a bright 

 orange colour, which is the seed. A mildew of this kind, 

 which infects corn, is highly injurious to the farmer. It 

 is vulgarly called the pepper brand ; and, when corn 

 is attacked by it, it gradually consumes the substance of 

 the grain, leaving in its stead only a dark powder, which 

 has a very offensive smell. This fungus is found only on 

 barley, and in this respect differs from the C/redo ^Segetum, 



Y 4 



