some Indian Selaginellas. 691 
the commencement of furcation and was noted in .S. chrysocaulos. Text- 
fig. 5, A, shows a distinct appearance of dichotomy of the rhizophore heads. 
The epidermal cells of the ends of the rhizophores grow out into long root- 
hairs (Text-figs. 5, 6, and 7), which are often so much developed as to 
appear to the naked eye as masses of hyphae (Text-fig. 4, at A ; cf. the 
development of root-hairs at the ends of rhizophores in 5 . chrysocaulos , 
Text-fig. 1). 
Text-fig. 6. S. chrysorrhizos. A and b show diagram matically two transverse sections of an 
‘ underground tuber ’. The lettering is the same as in Text-fig. 5. This tuber shows very clearly 
the closely-overlapping scale leaves (/.). In A continued growth of the dorsal rhizophore is indicated, 
x 32. 
Text-fig. 7. S. chrysorrhizos. Longitudinal section of the end of a rhizophore, showing the 
development of the epidermal cells forming root-hairs. The central area, in which the root-hairs 
are not developed, is clearly indicated, x 275. 
A similar formation of root-hairs was rioted by Sarauw, 1 who grew 
species of Selaginella over distilled water. The swollen ends of the rhizo- 
phores produced root-hairs about 3 mm. long, forming at first a little 
disc and later appearing as a short brush, the hairs of which were arranged 
1 Sarauw, G. F. L. : Versuche fiber die Verzweigungs-Bedingungen der Stfitzwurzeln von 
Selaginella. Ber. der deutsch. bot. Ges., Bd. ix, 1891, p. 63. 
3 A 
