LICHENS. 



215 



or 

 o 



1. SECTION OF DOG LICHEN. 

 SHOWING UPPER AND UNDER 

 BARK AND MEDULLARY 



Trelawny woods. Both in the hedge-banks and anion 

 the richest moss in the woods, the Large Dog lichen dis- 

 played its leaf-like fronds. This 

 plant measures several inches, 

 and its tinted fronds, varying 

 from grey to olive, look very 

 beautiful beside the verdant 

 moss. At first sight it gives one 

 the idea of a torn kid glove ; but 

 the white underside is closely set 

 with prickle-shaped hairs. The 



receptacles are orange, and they later> with G0Kn)IA 

 are freely disposed along the 2. branch of globe lichen. 



-, -, p ,i p i ,i l i -3. APOTHECI.E OF NEPHROME. 



lobes of the frond ; the border is 



the same colour as the disk. This, then, is the Dog 

 lichen (Peltidea caninea, Plate XV., Jig. 14), formerly 

 believed to be an antidote to hydrophobia; and certainly 

 it would be difficult to overpraise its beauty, whether it 

 may be able to boast of any use or not. In gathering 

 some of the handsome fronds of this lichen, we could not 

 avoid tearing them. This afforded the opportunity for 

 noticing; its structure: and we sat down on the bole of a 

 fallen tree to discuss our biscuits and examine our torn 

 frond, and apply our Codington lens to ascertain the 

 arrangement of the bark and gonidia. Even with the 

 naked eye we could discern the upper covering or bark, 

 the middle or medullary layer, and the under coat with 

 its clinging fibres. We knew that the fruit, whether in 

 its perfect form of shields, or its secondary development 

 of powdery warts, took its rise from the medullary layer, 

 the seat of the gonidia. By subjecting the section to the 



