XIV 



L YCOFODINE^ 



495 



unbranched until it has reached a length of a centimetre or 

 more, and has produced numerous leaves. 



The Sporophyte 



The sporophyte of SclagiiicUa closely resembles that of 

 Lycopodiiuii, and, as in that genus, the leaves may be arranged 

 radially, or the stem may be dorsiventral with the leaves in 

 four rows ; the latter is much the commoner arrangement, 

 however, but 5. rupestris may be mentioned as a familiar 

 example of the homophyllous type. In many species there is 



Fig. 260. — A, Part of a fruiting plant of Sclaginella Kyaiissiana, X 3 ; s/>, sporangial strobilus ; R, 

 young rhizophore ; B, longitudinal section of the strobilus, X 5 ; /«a, macrosporangium ; mi, 

 microsporangium. 



a creeping stem from which upright branches grow, much as 

 in many species of Lycopodiuui, but in others there is no clear 

 distinction between these parts. The roots may arise directly 

 from the ordinary branches, but in many species, e.g. S. Kraus- 

 siana, they are borne at the end of peculiar leafless branches 

 or rhizophores (Fig. 263, A). These, like the stem, show an 

 apparently regular dichotomous branching, which, however, is 

 really monopodial. The leaves, like those of Lycopodiuni, are 

 small, more or less lanceolate in outline, and with a single 

 median vein. In the dorsiventral shoots the leaves are 



