214 LICHENS. 



grew in crevices between the stones in the wall, its thick 

 semi-transparent dark olive fronds crowded together, and 

 bearing numbers of chestnut apothecise, shield-shaped, 

 and often so crowded together as to become confluent. 

 But these were bygones on the day of our Hannaford 

 expedition, and we pressed on from the rocks, which 

 gradually became lower, and destitute of samphire, and 

 wild beet and thrift — only now clothed with seaweed, 

 showing that they were submerged at high tide ; and we 

 turned our attention to the sand banks, down which the. 

 water oozed from the upper land, encouraging the growth 

 of many a moss and lichen. Here was a plot of gelatin- 

 ous-looking shields, of an orange brown, bordered with 

 the same colour; the fronds to which they were attached 

 were almost covered by the receptacles, and were of a 

 spongy nature, so that we decided this to be the Sponge 

 Jelly lichen (C. spongiosum). Near it was a rough black 

 stain, which under the magnifier showed many little gela- 

 tinous branches, with shields interspersed. It was very 

 minute, but we were able at once to pronounce it the 

 Dwarf Jelly lichen (C. subtile). Little orange shields 

 scattered on the firm sand, their crust being scarcely per- 

 ceptible, announced the presence of the Eed and Black 

 Scurf lichen ; and the Ground Lecidea was there too, so 

 that the barren sand-bank boasted its four lichens. 



There are many more species of the Collema group, but 

 they are all marked by the same characteristics, but these 

 were all which we have been able to collect. 



Leaving; the shore we crossed some fields which 

 brought us to a farm called Port Looe, and we pressed 

 onwards along the lane leading from thence towards the 



