PTERIDOPHYTA 145 
In Selaginella (Fig. 38), while the embryo closely 
resembles that of Lycopodium, the gametophyte is very 
different. The sporophyte produces two sorts of spores, 
large and small. The former, the macrospores, produce 
a rudimentary gametophyte, which bears only archegonia 
(Fig. 38, E). The gametophyte projects from the spore 
but little, and until its later stages is contained entirely 
within the macrospore. In germination there areé first 
Fic. 38 (Lycopodinez).— A, a branch of one of the smaller club-mosses 
(Selaginella) with two sporangial spikes, sp; B, longitudinal section of 
spike showing a single macrospurangium, ma, and several microsporan- 
gia, mi; C, germinated microspore containing the rudimentary male 
gametophyte; 7, the single vegetative cell; an, the antheridium; D, a 
spermatozoid (after Belajeff); E, germinating macrospore with the 
female gametophyte protruding; ar, archegonia; F, a single arche- 
gonium; G,a young embryo, em, attached to the suspensor, sus, whose 
base remains within the archegonium; H, young sporophyte, still at- 
tached, to the gametophyte within the macrospore; cot, cotyledons; 
T, root. 
produced within the spore numerous free nuclei, be- 
tween which, later, cell-walls arise, forming a continuous 
tissue much as in the “embryo-sac” of the flowering 
plants. The formation of the gametophyte begins in 
Selaginella before the spores are set free from the 
sporangium. The small spores or microspores produce 
an even more rudimentary gametophyte (C), which is 
L 
