60 103. SELAGINELLA. 



the unbranched portion isomorphous or nearly so, those 

 of the branches heteromorphous. 



6. fubetcentef. Mostly large or middle-sized species; 

 shoots commonly ascending or erect, often branched in 

 the upper part only; stems as a rule more then 3 A 

 mm. thick, more or less distinctly pubescent; root-fibres 

 rather confined to the lower nodes, often to the base 

 only. 



b. Heterostachys. Sporophylla heteromorphous, the 

 smaller, more ascending ones commonly in the same plane 

 as the larger, spreading leaves, and vice versa, the spikes 

 therefore distinctly flattened (platystichous), often much 

 broader than thick. 



1. Interteartae. Small species, often densely caespitose; 

 shoots decumbent, at best ascending towards the apex; 

 rachises to 6 mm. broad including the lateral leaves; 

 root-fibres often extending to the higher nodes. 



2. Bitulcatae. Large or middle-sized species; shoots 

 decumbent, at best ascending towards the apex ; rachises 

 6 10 mm. broad including the lateral leaves; root- 

 fibres often extending to the higher nodes. 



3. Suberotae. Small or middle-sized species; shoots erect, 

 or ascending from a decumbent base; stems less than 

 1 mm. thick, or the root-fibres confined to the lowest 

 portion. 



4. Brachystachyae. Large or middle-sized species ; shoots 

 erect, or ascending from a decumbent base; stems more 

 than 1 mm. thick, the root-fibres not confined to the 

 lowest portion. 



2. PLEIOSTELICAE. Stems traversed by 39 steles. 



B. ISOPHYEjLUH (Boreoselaginella). Leaves isomorphous or nearly 

 so, subdecussate, the branches therefore more or less dorsiventral. 

 (Not in Malaya). 



C. HO11OEOPHYLLU1I (Euselaginella). Leaves isomorphous, 

 decussate or radiate, the branches therefore rather regularly square 

 or cylindrical. (Not in Malaya). 



