LICHENS. 213 



nearly at the height ; and many an unwary vessel sticks 

 fast there. A zostera bed marks the low tide on the 

 mainland, and the crop of fucnses and "dead mens ropes" 

 is most flourishing. As soon as I could gain the shore, I 

 began climbing from rock to rock towards the mouth of 

 the river. The ground beyond high-water mark was 

 spongy, and the flat tops of many of the rocks were 

 grassed over. Here we found our old friend, the Crab V 

 eye lichen, in abundance, accompanied by its faithful 

 ally, the Black-shield lichen. The Yellow Scaly lichen 

 and the Wall Parmelia were liberal of their orange shields 

 and spreading fronds, and they coloured the grey rocks 

 brilliantly. On one of the grassy flats I found what 

 seemed like roughly-shapen, thickish leaves of green jelly, 

 the under part paler than the upper. I could find no re- 

 ceptacles ; but from the peculiar appearance of the plant, 

 and its resemblance to the common nostoc, or " star- 

 slough," I felt sure it was the Shaking Jelly lichen 

 (Collema tremelloides). This was a member of the lichen 

 order next succeeding to the Sticta, and called Collema 

 from its glutinous structure. The plants of this group 

 have round apothecise, bordered, the disk coloured with 

 brown ; their whole structure is gelatinous. 



On the steep wet banks beside the deep cutting form- 

 ing the junction road near Hawkhurst, we had once- 

 found the gelatinous olive fronds of the Great Jelly 

 lichen (C. granulatum, Plate XV., fig. 1). It was of a 

 darker colour than the Hannaford species, but more 

 regular in shape : it had no shields. Walls about Brix- 

 ton Deverill in Wiltshire furnished us with abundance of 

 the Crisp Jelly lichen (C. crispum, Plate XV., Jig. 2). It 



