PRINCIPAL GROUPS OF PLANTS. 



lO: 



consisting of microsporophylls (stamens) are more or less elon- 

 gated and cylindrical or ovoid (Fig. 69, A). The carpellate 

 cones consisting of megasporophylls (carpels) have a shorter 

 longitudinal axis, and the cones vary considerably in the different 

 groups (Fig. 72). 



Fig. 66. Several species of Lycopodium. i, Ground pine (L. .obscurum) showing a 

 leafy branch with one strobile at the apex; 2, a branch of trailing Christmas green (L. 

 complanatum) bearing four or five strobiles at the apex of long dichotomously branching 

 stalks; 3, club moss or running pine (L. clavatum) with a branch bearing four strobiles; 

 4, shining club moss (L. lucidulum) with small sporangia borne in the axils of the leaves. 



The Microsporophylls (Fig. 69) are usually of a yellowish- 

 brown color, and consist of a slender stalk and a lamina which 

 bears the microsporangia (pollen sacs) on the lower or dorsal 

 surface (Fig. 69, B, C). In this they show a resemblance to 



