of the Anatomy of the Genus Selaginella , Spr. 177 
this species which, if confirmed, would tend to show that 
X. spinosa is not the only species with central protoxylem. 
He says : * La tige, examinee entre la spore et les deux 
premieres feuilles, ne presente rien de particulier en ce que 
concerne 1’epiderme et l’ecorce. II n’en est pas de meme du 
cylindre central ; le protoxyleme occupe le centre et est 
entoure plus ou moins regulierement par du metaxyleme ; le 
liber entoure le tout.’ This observation is of peculiar interest, 
seeing that Braun had already pointed out that the rhizophore 
of this species has also a central protoxylem. Not having 
as yet studied material so young, I am unable to speak on the 
subject from personal observation, but hope to do so later 
when my researches on development are completed. 
41. Selaginella Poulteri , Veitch. Bakers Handbook, 
No. 193. 
In anatomical structure this species very closely resembles 
X. Kraussiana. The arrangement of the steles is the same, 
save that the two steles between the points of origin of 
branches are often connected for a considerable distance by 
their pericycles, and even by metaxylem. Here and there 
the steles are separated by a reticulum of trabecular tissue, 
some of the cells only having cuticular annuli. Most of these 
cells are entirely cuticularized, whilst others again have no 
cuticular development, showing indeed an appearance quite 
similar to that figured (PI. X, Fig. 50) as occurring at the 
points of origin of the branches of X. Kratissiana. Histo- 
logically the structure of the stele is so similar to that of 
X. Kraussiana that a separate description is unnecessary. 
42. Selaginella rubella, Moore. Baker’s Handbook, No. 183. 
Anatomically this species is close to X. Galeottei , although 
it, like S. Poulteri , does not belong to the ‘ Articulatae.’ A 
section of the erect stem, indeed, might very well be repre- 
sented by Fig. 41, PI. X, where a transverse section of the 
stem of X. Galeottei is figured. The method of fusion of steles 
is, however, identically the same as that in X. sulcata. In the 
procumbent parts of the stem, where the leaves are deciduous, 
the two steles are fused into one bulky ribbon-shaped stele, 
