494 THE JOURNAL OF BOTANY 
membrane-gaps. Capsule dark brown. Spores rusty red. Male 
inflorescence on the somewhat inflated apex of the comal branches. 
Hab. On wet elevated heaths and in peat bogs. 
Distrib. Scandinavia, Russia, eee raion ht ee 
France, Scotland, England; Asia; N. Am Ss. Am 
This very distinct species is not Drienselly "dnaiuerindal by the 
pacers of the peculiar comb-fibrils, in some forms these being 
entirely absent, but by the form pe position of the chlorophyllose 
cells of the braneh- leaves, by the stem-leaves, and the very numerous 
fibrils in the cortical cells of the stems and branches. 
There are three main varieties 
(1) Var. cristatum Warnst. in " Hedwigia, 1889, pp. 367-872. 
Comb-fibrils numerous throughout the lower half of the branch- 
leaves. Lyth Moss, Westmoreland (Barnes in Braithw. Sphagn. 
Brit. Exsice. No. 1, 1877. A form intermediate between var. 
eristatum and var. subleve) ; stn noe oe Ross (Braithwaite) ; 
ween Stornoway and Garynahin Hebrides (Smith) ; 
Raplock Moss, New Galloway, Kirkeudbright (fearon); Wither- 
slack Moss, Westmoreland (Bar po Latheron, Caithness (Lillie) ; 
Lochan-na-Lairge, Perthshire (Cocks) ; Meall-nan- Catal an, 
Perthshire anpere ). 
r, subleve Warnst. l.c. Comb-fibrils only slightly de- 
Mc ah frequently with only slender beginnings of fibrils near the 
leaf-bas 
(3) fe affine Warnst. in Bot. Gaz. 1890, 250. Syn. S. afine 
Ren. & Card.; S. imbricatum var. leve Warnst. in Hedwigia, 1889, 
pp. 867-872. Comb-fibrils completely absent. 
5. §. pegenerans Warnst. in Hons Centralbl. xlii. 1890, 102. 
Plant completely submerged, green above, greyish below. Stem 
slender, 20-30 cm. long, ne ba long, thin, stem-like branches from 
the middle or is upper 
Wood-cylinder whitish on ‘ue yellowish. Stem-cortex of the main 
axis in 2-8 layers; cells very wide and thin-walled, either quite 
without fibrils or with few very delicate fibrils; pores on the super- 
ficial wall numerous up to six in each a” large and non-ringed. 
gaps in the middle of the cell-walls. Leaves of the main branches 
resembling those of the spreading branches in form and cell-structure, 
but larger; sometimes quite without fibrils, more freque: ntly fibrillose 
and porose to the base; not rarely in the upper one-third formed of 
chlorophyllose cells only. 
Fascicles distant, in the lower part of the plant composed of 
three branches. of which two are stronger and spr the 
third is weaker and appressed to the stem; the fascicles on the 
