COMPENDIUM. XV 



FAMILY XV. LYCOPODIACEAE. Leaves simple, crowded around 

 the base of a short, naked stem or arranged along a much 

 elongated and mostly branched stem. Sporangia 1-locular, 

 on simple sporophylla. 



GENUS 102. LYCOPODIUM. Stems elongated, 

 copiously foliaceous everywhere or on the 

 branches only. 



SUBORDER II. *I I,%4.I^E 8 3 I\I %H (Heterospore 



Lycopodiales). At least the younger leaves provided with a minute, 

 decoloured tongue-shaped organ (ligula) on the upper side, at the 

 base. Sporophylla forming lateral or (more generally) terminal 

 spikes or placed with the barren leaves in a dense rosette 

 forming alternate barren and fertile cycles. Sporangia hetero- 

 morphous, containing either macrospores or microspores; spores 

 producing more or less rudimentary prothallia, those of the 

 macrospores bearing archegonia, of the microspores antheridia. 



FAMILY XVI. SELAGINELLACEAE. Leaves small, flat, without 

 air-channels, arranged along a slender, elongated stem. Sporo- 

 phylla aggregated in spikes; sporangia superficial, 1-locular. 



GENUS 103. SELAGINELLA. Characters those of 

 the family. 



FAMILY XVIa. LEPIDOPHYTACEAE. Contains extinct genera only. (') 



FAMILY XVII. ISOETACEAE. Leaves elongated, terete or semi- 

 terete, with air-channels, crowded around a short, tuberous 

 stem. Sporophylla occupying the outer leaf-cycles; sporangia 

 imbedded, incompletely plurilocular. (Not in Malaya). 



FAMILY XVIIa. PLEUROMOIACEAE. Contains extinct genera only. ( 2 ) 



0) With 3 subfamilies; the Lepldodendraceae, the Bothrodendraceae 



and the Slglllariaccac. Poton., in Engl. & Prantl, Nat. Pfl.Fam., I 4 , 717, 739, 740. 

 ( 2 ) The ancestral family of the Isoetaceae. Poton., in Engl. & Prantl, Nat. 

 Pfl.Fam., I 4 , 754. 



