314 MR. W. 0. HOWARTH ON THE OCCURRENCE AND 
to Watson’s vice-counties (1883). Types of habitat, where given, are from 
experience gained in collecting. It is hoped that the forms here brought 
together will be recognized by ecologists and their particular habitats 
recorded, so that their distribution can be worked out ecologically, at present 
impossible owing to lack of available data (the poverty of herbarium sheets 
in these details is well known). In the meantime it is hoped to test fully 
the distinctions made in order to confirm them or otherwise by experi- 
mental breeding. The author would be pleased to receive from any collectors 
material for determination, together with records of habitat and locality 
which can be incorporated in further work on this subject. 
I. DESCRIPTION OF THE SPECIES. 
The forms of Festuca rubra according o Hackel’s system (1882) occurring 
in Britain are :— 
Subsp. I. heterophylla. 
o LV. eu-rubra. 
var. 1 (6). genuina. 
subvar. a. vulgaris and its forms pascua and nemoralis. 
B. grandiflora and its form litoralis. 
y. glaucescens. 
6. juncea. 
e. barbata. 
E. arenaria. 
var. 2 (7). planifolia. 
var. 4 (9). fallax. 
Subsp. V. dumetorum. 
Reasons are given in the following pages for considering the group 
according to this arrangement and nomenclature, viz. — 
Sp. I. heterophylla Lam. 
„ II. rubra Linn. emend. 
Subsp. 1. fallax Thuill. 
2, genuina Hack. 
var, a. vulgaris Gaud. 
b. grandiflora Hack. 
c. tenuifolia How. 
d. glaucescens Hegets. & Heer. 
e. dumetorum Linn. 
f. planifolia Hack. 
g. juncea Hack. 
h. arenaria Qsb. 
Sp. III. juncifolia St. Am. 
The various forms are accordingly described under these names, 
