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THE EUROPEAN SPHAGNACEE 115 
§ 1. Sphagna acutifolia Schimp. Spp. 1-11. 
Most of the superficial cortical cells of the stem with a 
single large non-bordered pore; inner surface of the 
entire upper half of the with large round pores 
which are sometimes opposite the pores on the outer 
surface ; st. 1. usually i “fbr ils 4 
Superficial cortical cells of the stem rarely ab. a ine 
pores; inner surface of the br. 1., especially near the 
lateral margins in the middle and pote parts of the 
leaf, with large round non-bordered — st. 1. with or 
without fibrils 5 
St. 1. more or less Renee towards the casei. Setsieias : 
on the wide rounded apex and for some distance down 
the lateral margins, fimbriate by reabsorption of the cell- 
walls. Wood-cylinder of stem and wigs never red. 
S. fimbriatum Wils. 
St. 1. not widened above, lingulate, fambriate i. with very 
few exceptions, on the wide rounded apex; membrane of 
the hyaline cells in the upper om of the leaves always re- 
absorbed. Wood-cylinder of stem and ee never red. 
. S. Girgensohnii Russ. 
St. 1. lingulate, only in the middle of the alt rounded apex 
slightly fimbriate; walls of the hyaline cells in upper part 
of the leaves never re-absorbed; frequently without fibrils, 
but often fibrillose in upper part of the leaf. Wood-cylinder 
of stem and branches frequently (¢ a are always) red. 
. S. Russowii Warnst. 
. St. 1. more or less lingulate, without Abrile (in S. rubellum 
» not 
one fibrillose in aes men — of br. 
dent 
St. 1. ae a wih iss more or ues nutes ahane: jen 
a pe to triangular- mpi with or without fibrils. 
Margin of br. 1. not dentat 
« ieee pee a narrower base vine iad ‘ re mi aa 
and thence produced to a broadly truncate, toothed apex ; 
border narrow and of equal width from apex to base; with 
or without fibrils. Br. 1. with the upper margins minutely 
dentate. Wood-cy — nen Loren or 40 gee Tufts 
usually pale- or greyish-gre molle Sulliv. 
Br. 1. when dry (especially in oi sxpealuns) 5 erecto- 
patent, those of the basal half of the spreading branches, 
on the outer surface towards the apex with very small, 
round, atronghroiniet sail ; st. 1. always non- one 
Wood-cylinder of the stem never ee Tufts 
reddish to dark purple ag Warneoent Russ. 
: ae fe of the spreading besnchias ‘uate iis dry (especially 
the upper branches) more or less secund and with a 
aoa Lone truncate, almost cucullate apex; on the 
outer surface in the apical part with large semi-elliptical, 
