202 A TEXT-BOOK OF BOTANY 
far more conspicuous plants than they are now, and only 
the smaller forms have persisted to the present time. 
116. Strobilii—One of the conspicuous features of the 
lycopods is the cylindrical strobilus, which usually termi- 
nates the erect branches, and is the “club” that enters into 
the name club-moss (Fig. 193, 1). Sometimes the strobilus 
is quite distinct from the rest of the stem; and sometimes it 
cannot be distinguished from it, so that there is no external 
indication where leafy stem ends and strobilus begins. 
The leaves of the strobilus resemble the ordinary fo- 
liage leaves; but each one is a sporophyll, bearing a single 
large sporangium on its upper surface at the base (Fig. 193, 
B), so that the sporangium ap- 
pears in the axil of the sporo- 
phyll. Among the ferns the spo- 
rangia are numerous on the under 
a ¢ --~--s side of leaves; among equisetums 
they are several on the under side 
of sporophylls; among lycopods 
they are solitary on the upper 
side of sporophylls. 
117. Lycopodium.—The Lyco- 
podium forms are chiefly the 
coarse club-mosses of temperate 
regions, and are mostly spoken of 
as the large club-mosses. The 
strobili are often conspicuous and 
very distinct from the rest of 
the plant. This leafy, branching 
plant with its strobili is, of course, 
the sporophyte (Fig. 193, A). 
“Fre. 194.—Subterranean gam- When its spores germinate they 
etophytes of Lycopodium, »roduce gametophytes; but these 
showing their irregular, tu- 
berous form; the dotted line o Oo , ins - 
ee gametophytes, instead of being 
soil.—After Brucamann. | green, prostrate, thallose bodies, 
