Elementary botany . dimentary shoot and root and several thick green they fall to the ground they grow into new lycopodium plants, just asthe bulbils of cystopteris do which were described in the chapter on ferns. 583. Note.—The prothallia of the species of lycopodium which have beenstudied are singular objects. In L. cernuum a cylindrical body sunk in theearth is formed, and from the upper surface there are green lobes. In and some others slender branched, colorless bodies are formedwhich according to Treub grow as a saphrophyte in decayed bark of of the pr
Elementary botany . dimentary shoot and root and several thick green they fall to the ground they grow into new lycopodium plants, just asthe bulbils of cystopteris do which were described in the chapter on ferns. 583. Note.—The prothallia of the species of lycopodium which have beenstudied are singular objects. In L. cernuum a cylindrical body sunk in theearth is formed, and from the upper surface there are green lobes. In and some others slender branched, colorless bodies are formedwhich according to Treub grow as a saphrophyte in decayed bark of of the prothallia examined have a fungus growing in their tissue whichis supposed to play some part in the nutrition of the prothallium. The little club mosses (selaginella). 584. Closely related to the club mosses are the plants resemble closely the general habit of the club mosses,but are generally smaller and the leaves more delicate. Somespecies are grown in conservatories for ornament, the leaves of. Fig. 328. Fig. 329. Selaginella with Fruiting spike three fruiting spikes, showing large and (Selaginella apus.) small sporangia. Fig. 330. Fig. 331. Large spo- Small spo-rangium, rangium. such usually having a beautiful metallic lustre. The leaves of someare arranged as in lycopodium, but many species have the leavesin four to six rows. Fig. 328 represents a part of a selaginellaplant (S. apus). The fruiting spike possesses similar leaves, butthey are shorter, and their arrangement gives to the spike a four-sided appearance. 111 nt ww LITTLE CLUB MOSSES. 2S7 585. Sporangia.—On examining the fruiting spike, we findas in lycopodium that there is but a single sporangium in theaxil of a fertile leaf. But we see that they are of two differentkinds, small ones in the axils of the upper leaves, and large onesin the axils of a few of the lower leaves of the spike. The micro-spores are borne in the smaller spore-cases and the macrosporesin the larger ones. Figures 329-33
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