10 112 Proceedings of the Boy al Irish Academy. 



Plate IV. 



Fig. 1. — The wood at Portlea is the best developed piece of woodland 

 remaining on Clare Island. Betida pubescens is predominant, one old tree 

 attaining a height of 10 feet. The other trees and the shade plants which 

 occur are listed on pp. 19-20. The boulder-beach of Portlea appears in the 

 middle distance, with drift-capped cliffs of Carboniferous sandstone beyond. 

 Photographed September, 1909. 



Fig. 2. — Shows the luxuriance of vegetation where shelter from wind is 

 afforded. . The spot where this photograph was taken lies close to the lower 

 left-hand corner of fig. 1. Photographed June, 1910. 



Plate V. 



Fig. 1. — The only habitat of Erica mediterranea on Clare Island is a slope 

 of Boulder-clay facing north-east and dropping to the sea, near Portlea. No 

 peat is present in the soil. Frequent slips of the material occur after rains, 

 destroying many plants. Cephalanthera cnsifolia and Listera ovata have their 

 only island station close by. For a note of the insects which fertilize the 

 fiowers of E. mediterranea here, see p. 30. Photographed June, 1910. 



Fig. 2. — Silene acaadis at 1,200 feet on Croaghmore. The blossoms are 

 being devoured by Arion ater, which swarms on the cliff. Photographed 

 June, 1910. 



Plate VI. 



Fig. 1. — Characteristic bosses of Silene acaulis, and of Hymenophyllum 

 unilaterale plus Mnium hornum, at 1,200 feet on Croaghmore. Saxifraga 

 unibrosa near the top of the picture. Photographed June, 1910. 



Fig. 2. — Saxifraga decipiens at 1,000 feet on Croaghmore. A strong young 

 plant, colonizing rock laid bare by a recent fall. Photographed June, 1910. 



