of the Anatomy of the Gams Selaginella , Spr. 1 7 1 
S. Braunii (in five lines) under the name of S. puhescens, Spr. 
The present species is, however, 5 . pnbescens , A. Br. non Spring. 
I feel no doubt, however, from his description that he means 
S. Braunii , Baker, and if I am right in that belief then he has 
failed to note the differences existing between the erect and 
creeping axis. He says that the species is easily recognized 
by the presence of trichomata ; hairs, however, occur on other 
species, and the plant does not require such accessory aids for 
identification. 
36. Selaginella spinosa, P.B. Baker’s Handbook, No. 1. 
It is somewhat remarkable that, notwithstanding that 
S. spinosa is one of the very few European species of Selaginella , 
and the only British representative of the genus, so little 
seems to be known about its anatomy. Bruchmann ( 18 ) has 
dealt with some points in the development of the vegetative 
organs, but has not apparently made any investigations into 
the mode of arrangement of the permanent tissues. De Bary 
refers to the anatomy of the stem three times in his Ver- 
gleichende Anatomie. At p. 283 (Eng. Ed.) he speaks of the 
stem as having ‘ a single axile bundle of roundish transverse 
section (and with a structure differing from that of other 
species) ; the leaf-bundles insert themselves on it on all sides.’ 
At p. 343, speaking of the structure of the concentric bundle, 
he says that ‘ three (primitive groups of xylem-elements) occur 
near the middle in the round axial bundle in the small stem 
of Selaginella spinulosa * ( = S. spinosa). Later on, at p. 430, 
he describes the sclerosis as limited to the epidermis. Dan- 
geard (22) describes the stem as having a rounded stele with 
four points of protoxylem, or three by union of two of these. 
From these, the only anatomical references I can find, it will be 
seen that De Bary alone gives a suggestion of difference in 
the structure of the stele at different levels. 
The stem is partly trailing, partly semi-erect ; the leaves are 
throughout homophyllous and inserted all round the stem. If 
the stelic system be dissected out entire, it will be found that 
the upper part of the stem near the apex shows the leaf-traces 
inserted all round the stele and a series (seven in all) of distinct 
N 2 
