1 86 Gibson . — Contributions towards a Knowledge 
49. Selaginella gracilis , Moore. Baker’s Handbook, No. 
216. 
This species does not differ anatomically from the typical 
tristelic form, save that in older branchings the dorsal stele of 
the chief axis below the origin of a branch is formed by the 
fusion of the dorsal steles of the chief axis and of the lateral 
branch, the median steles of the primary and secondary axes 
behaving like the single steles of the primary and secondary 
axes of the typical monostelic forms. There is, as usual, 
a fusion of all the steles just at the point of insertion of the 
axillary leaf. 
In the creeping stems a gradual fusion of steles occurs, as in 
other tristelic species, the earliest condition being monostelic. 
50. Selaginella viridangida , Spr. Baker’s Handbook, No. 
224. 
The chief anatomical characters of the stem of this species 
are the slight fusion that occurs between the various steles at 
the points of origin of branches, and the tendency which the 
ventral stele has to split into two parallel steles. The course 
of the steles is as in S. gracilis. There are no special histo- 
logical characters which distinguish X. viridangida from the 
normal tristelic forms. 
51. Selaginella chilensis , Spr. Baker’s Handbook, No. 225. 
This species is said to be possibly conspecific with 
S', canaliculata , Spr. Anatomically and histologically a de- 
scription of the stem of the one might stand for that of the 
other ; it is therefore unnecessary to repeat the account already 
given for that species. 
52. Selaginella Victoriae , Moore. Baker’s Handbook, No, 
218. 
The creeping axis of S. Victoriae shows a transition from 
a monostelic to a tristelic condition entirely similar to that 
seen in S. inaequalifolia (PI. XI, Fig. 67). In the erect shoots, 
which are also tristelic, the ventral stele generally bifurcates, 
as in X. viridangida (PI. XI, Fig. 72). The structure of the 
steles, and their mode of origin and fusion, agrees funda- 
mentally with the other tristelic species already described. 
