the Anatomy of the Genus Selaginella , Spr. 127 
The stomata he describes as distributed, as a rule, over the 
midrib on the aligular face of the leaf, more rarely over the 
entire aligular surface. In the Rosulatae group (e. g. S'. con- 
\ voluta , S'. ctispidata , & c.) stomata, according to Dangeard, 
occur on both sides of the leaf. He also draws attention to 
the sclerotic cells of the epidermis of several species, and to 
the uni- (or more rarely pluri-) cellular hairs which occur along 
the margins of some leaves. Dangeard finally describes the 
vein as composed of a small cluster of protoxylem-elements 
only surrounded by phloem, adding ‘ le faisceau de cette 
nervure ne possede jamais de metaxyleme comme celui de la 
tige.’ On this point he is at variance with Russow, who 
speaks of the xylem as being composed of ‘ Schrauben- und 
Netzzellen.’ In S. sulcata Dangeard describes the phloem as 
limited to the under surface of the bundle, and points out the 
occurrence of bast-fibres (fibres liberiennes) in the phloem of 
5. stenophylla. He again differs from Russow in asserting 
the presence of an endodermis, though ‘ certainement mal 
differencie.’ Wojinowic 1 , in his thesis on Selaginella lepido- 
phylla , gives an exhaustive account of the structure of the leaf, 
calling attention especially to the presence of stomata on 
both sides of the ventral leaf, and to their absence from the 
aligular face of the dorsal leaf. He says, speaking of the 
latter, c Die Epidermis dieser Seite (der organischen unteren, 
vom Stengel abgewendeten Seite) fiihrt keine Spaltoffnungen,’ 
and again, ‘ In der Epidermis der organischen Oberseite (d. h. 
der dem Stengel anliegenden) finden sich Spaltoffnungen.’ 
In this statement he is supported by Erikson (/. c .), who says, 
in discussing the dorsal leaf, ‘ Epidermis pa den undre (uppat- 
vanda) ytan bestar af langstrackta celler med tunna, nastan 
rake mellanvagger och saknar klyfoppningar. Pa den ofre 
(inatvanda) sidan finnas ytterst talrika klyfoppningar, hvilka 
aro strodda ofver hela ytan/ I have examined a very large 
number of specimens from the Botanic Gardens of Kew, 
Strassburg, Glasgow, &c., and in all cases I found that the 
1 Beitrage zur Morphologic, Anatomie und Biologie der S. lepidophylla , Spr., 
Breslau, 1890. 
