Studies in the Morphology of Selaginella pumila, Spring. 205 
phyllous to the anisophyllous condition does not appear to have been 
observed before in this species. 
The root of S. pumila is entirely devoid of root hairs. The mycelium of 
an endophytic fungus was found to be present in all the material examined, 
Fig. 11. Fig. 12. Fig. 13. 
and is especially abundant in the large cells of the inner cortex (figs. 14, 
15). It is probable that infection of the root cells takes place through the 
epidermis, as hyphae are often observed in contact with the outer surface 
of the root and occasionally in the cavities of the epidermal cells. The 
hyphae appear to be restricted to the subterranean parts of the root system. 
Fig. 14. 
The nature of the fungus, its mode of entry into the root and the relation- 
ship existing between the two plants, will be dealt with in a later paper. 
Bruchmann has recorded the presence of an endophytic fungus together 
with the absence of root hairs for S. spinulosa (1) and S. preissiana (3), 
while Janse (6) has reported fungus mycelium in the roots of certain Javanese 
species of the genus. More recently Uphof (16) has described and figured 
traces of fungus mycelium in S. rubella. 
