GENERAL MORPHOLOGY 



293 



sometimes more sudden (L. E>alhousiaea?ium). Isolated sporangia in the 

 sterile region are more rare than in ^Selago, but they do occur (L. carinatum, 

 gnidioides, si/uarrosum} : also partially abortive sporangia have been seen 

 at the base of the strobilus (L. carinatum). All these characters together 



FIG. 142. 



Lycopodium Phlegtnaria> L. A figure showing habit of the whole plant. One-third. 

 Z? = end of a branch. Natural size. C a sterile leaf, somewhat enlarged. /} = sporo- 

 phyll seen from below, enlarged. = a sporophyll seen from above, enlarged. (From 

 Engler and Prantl.) 



show a very close similarity to what is seen in the Selago group, but with 

 gradually increasing definition of the strobilus from the lower vegetative 

 region. 



In the Phkgmaria group, which includes about eighteen species of 

 epiphytic character, the spikes are slender, and dichotomously forked, 

 with sporophylls as a rule very different in size from the foliage leaves 

 (Fig. 142). Occasionally sporangia may be found in the vegetative region 



