Contributions towards a Knowledge of the 
Anatomy of the genus Selaginella, Spr. 
BY 
R. J. HARVEY GIBSON, M.A., F.L.S. 
Professor of Botany in University College, Liverpool . 
With Plate VIII. 
PART II. THE LIGULE. 
HE present paper is the third of a series 1 in which 
-L I desire to record observations on the minute anatomy 
of the genus Selaginella , and deals more especially with the 
structure and development of the ligule. 
Accounts of the structure and development of the ligule in 
Selaginella are few and far between. Russow 2 , in discussing 
the structure of the leaf in this genus, refers to the ligule 
merely as a means of distinguishing one leaf-face from the 
other, — that next the stem being ‘ ligular,’ that away from the 
stem ‘ aligular.’ 
Treub 3 says : c Je n’ai pas etudie en detail la formation de 
la ligule,’ and both Dangeard 4 and Erikson 5 ignore its 
1 Annals of Botany, Vol. vii. No. xxvii, 1893, and Vol. viii. No. xxx, 1894. 
2 Vergleichende Untersuchungen liber Leitbiindel-Kryptogamen. Mem. l’Acad. 
Imper. St. Petersb. xix. 1872. 
3 Les organes de la vegetation du Selaginella Martensii , Spr. Leide, 1877. 
* Essai sur l’anatomie des Cryptogames vasculaires. Le Botaniste, Vol. i, 1889. 
5 Bidrag till Kannedomen om Lyeopodinebladens Anatomi. Arbet. fran Lunds 
Bot. Instit., 1892. 
[Annals of Botany, Vol. X. No. XXXVII. March, 1896.] 
