. Elementary botany. Botany. 234 MORPHOLOGY. develops the stalk, ana in the outer half the part which i^ formed from some of the inner tissue is also Fig. 267. Section of developing sporogonia of marchantia ; >it, nutriti\-i:; tissue of gametophyte ; st, sterile tissue of sporophyte ; spy fertile part of sporophyte ; va, enlarged venter of arche- gonium. 493. Embryo.âIn the- dcvelopniL-nt of the emhryo we can ser all the through this ilivision line betwiT-n the l)asal half, which is cinnpU-trly steriU-. and the outer half, which is the fertile part. In hj^. 267 we see a yuung
. Elementary botany. Botany. 234 MORPHOLOGY. develops the stalk, ana in the outer half the part which i^ formed from some of the inner tissue is also Fig. 267. Section of developing sporogonia of marchantia ; >it, nutriti\-i:; tissue of gametophyte ; st, sterile tissue of sporophyte ; spy fertile part of sporophyte ; va, enlarged venter of arche- gonium. 493. Embryo.âIn the- dcvelopniL-nt of the emhryo we can ser all the through this ilivision line betwiT-n the l)asal half, which is cinnpU-trly steriU-. and the outer half, which is the fertile part. In hj^. 267 we see a yuung emhryo, and it is nearly circular in section although it is conip(.)sed of numerous cells. The hasal half is tittached to the base of the iiURT siirlace of the archet^^onium, and at this time tlie arcliei^^uiium still surr(nnids it. The arche^oTiium continues to ij;niw then as tlie (.â ml>r\'o L;row>. and \\e can see the remains of the shrivelled neck. TIk' |)ortion of the eml>r\-o attached to the base ol the arcliei^onium is tin; sterile part and is called the " ; and later , the stalk. The sjioroi^onium durini; all the sta'^(.'S of its development derives its nourishment from the gamet^iphyte at this point of. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Atkinson, George Francis, 1854-1918. New York : H. Holt
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