'22G PTKUIDOl'HVTA. 



Class 3. Lycopodinae (Club-Mosses). 



The characteristics of this class have been given on page 205. 

 It consists of two sub-classes, one embracing isosporous, the other 

 heterosporous forms. 



Sub-Class 1. Lycopodieae (ISOSPOEOUS Lycopodinae) . 



One kind of spore. Prothallium large, partly green. Leaves 

 without ligule. 



Kin. 22'J. Lycopodium annotinwn : A em- FIG. 230. Lycopodiitm clavatum : 



b.vro (n:it. si/.c), with prothallium (pr), one portion of astern, bearing cones (a) ; 



embryo is broken off; B the prothallium ., a spore ; h sporangium in the axil 



(slightly iiiii-.'nified) ; C section through the of a leaf, s. 

 i rothallram :nnl embryo in the direction a-b 

 of A, iiinl vertically in the plane of the paper. 



Order 1. Lycopodiaceae. The VKOTHALLIUM is only known in 

 :i IV\v spi'cics at present, but in these it is more or less tubercular, 

 iiiid hears both antlicridia and archegonia. 



In L. iiiii/i'tiinnii the protlialliuin is a relatively large mass of cells, without 

 chlorophyll, ;m<l subterranean, in which the antheridia and archegonia are 

 embedded 1 ig. :>_".)). In the widely distributed tropical species, L. cernuum, 



