OF А CAMBRIDGESHIRE WOODLAND. 361 
remains. nearly saturated all through the year; the summer average is 50-55 
рег cent. Here Spirea is still the dominant form, but is associated with 
different species, such as :— 
Carew трата... 8 
C. acutiformis ............... r 
C. vulpina LLL. a 
C. vulpina var. nemorosa . r 
C. remota aa. о 
Besides these Carices other abundant species are :— 
Juneus еўивив............... о | Angelica sylvestris ......... о 
J. glaueus а. о Lythrum Salicaria ......... o to la 
J. lamprocarpus о. r according to light, 
Cnicus palustris ©... o Lychnis Flos-euculi ......... o 
Juncus bufonius and Callitriche stagnalis occur in this part in open spots, 
such as paths, &е. Oxlips, in common with most of the smaller herbs, are 
here rare or absent, but Primula vulgaris may occur. 
Furynchium prelongum is the principal moss in this part. 
II. Spirea Ulmaria and Deschampsia cespitosa Society. 
This society is separated chiefly for convenience of description from the 
foregoing. The main difference is in the light-intensity, which is greater 
than in the Spiræa Ulmaria Society ; in shady parts it is 0:03-0:06 and up to 
0*6 in others. 
Spirea Ulmaria is still the dominant plant, but becomes associated with 
numerous others that are intolerant of deep shade. This soclety can be 
divided into several sub-societies, depending on the degrees of light and soil- 
moisture. 
When the light is not more than 0:05 Spiræa is solely dominant, and al, 
stages can be found between this and the co-dominance of the species, which 
occurs at about 0*2 light-intensity. 
In this society other very abundant species are :—— 
Cnicus palustris ............... 0-ü 
Angelica sylvestris ....... ..... © 
Primula elatior ............... a 
Р. ошат. 1а 
P. elatior x vulgavis......... la 
Carew sylvatica ........ ese O 
2c2 
