372 MR. В. S. ADAMSON : АМ ECOLOGICAL STUDY 
In some small areas, especially those bordering on the caleareous clay, the 
soil is much more mixed with clay. Here Pteris адиЙта is much less 
abundant and Моих mollis absent; Calamagrostis lanceolata becomes the 
dominant form with 
Calamagrostis Epigeios ... 0 Scabiosa Succisa inon. ‚ 0 
Phalaris arundinacea ...... o | Potentilla erecta ...... ...... © 
Deschampsia eespitosa ... 0 | Stellaria Нойозеа............ T 
Angelica sylvestris ......... | 
Primroses and Anemone nemorosa аге practically absent. This part has a 
higher water-content, the minimum reached being 22 per cent. 
II. Holcus mollis Society. 
The differentiating factors between this and the previous society are not 
very marked. The soil here is rather more sandy and has a lower water- 
content ; this may fall as low as 10 per cent., the summer average being 
17-19 per cent., while the Pteris Society averages 19-22 per cent. 
This society is much more mixed than the previous one ; //oleus mollis is 
usually dominant, but locally its place is taken by Anthoranthum odoratum, 
and transitions occur between these two. The associates in the two extremes 
are rather different. In the Anthoranthum part this species is solely 
dominant, associated with 
Holeus mollis | ........... ee | Lonicera Periclymenum ... 1 
Luzula pilosa д... oo Angelica sylvestris ......... о 
L. multiflora Ё. congesta ... а | Polytrichum gracile ....... .. 
Viola Riviniana ............ а | 
The Моих mollis part of this society is much more extensive and more 
mixed. Besides /Joleus mollis the chief species are :— 
Anemone nemorosa ......... о | Veronica Chanurdrys ...... o 
Ranunculus auricomus... r | Nepeta hederacea .......... .. 0 
FR. Мечта 0000000... o Prunella vulgaris... T 
Viola Riviniana i iussus. а Ajuga reptans о... о 
Geum urbanum ............ a | Luzula кр. r 
Potentilla sterilis ............ oo L. pilosa .......... TEE . a 
Fragaria веха. о Carew (еротпа r 
Epilobium angustifolium ... | C. pilulifera......L.. eee 0 
Cirewa lutetiana с... la Anthovanthim odoratum... o 
Heracleum Sphondylium ... vr | Catharinea undulata ...... 0 
Angelica sylvestris ......... а Мтит undulatum ......... о 
Primula vulgavris....... sss. о 
