Organography of plants, especially of the archegoniatae and spermaphyta . ed leaves are absent, asin Calypogeia ericetorum. The appear-ance of leaves on the outside of thetube has given rise to the incorrect assumption ^ that a vegetative point liesin an umbilicate pit at the base of the tube, and that this produces could this vegetative point come ? The vegetative point of thefertile shoot is used up in the formation of the archegonia: it must thenbelong to a lateral shoot, and this leads to impossible results. Lateralshoots occasionally appear on the fertile shoot of Calypogeia
Organography of plants, especially of the archegoniatae and spermaphyta . ed leaves are absent, asin Calypogeia ericetorum. The appear-ance of leaves on the outside of thetube has given rise to the incorrect assumption ^ that a vegetative point liesin an umbilicate pit at the base of the tube, and that this produces could this vegetative point come ? The vegetative point of thefertile shoot is used up in the formation of the archegonia: it must thenbelong to a lateral shoot, and this leads to impossible results. Lateralshoots occasionally appear on the fertile shoot of Calypogeia ericetorum,but in quite another position. Gymnanthe. The method of formation of the tube or sac for thesporogonium in Gymnanthe saccata is somewhat different from that observedin Calypogeia, and has hitherto been incorrectly described. In Calypogeiathe calyptra is almost completely concrescent with the tube of the fertileshoot, but this is not the case in Gymnanthe saccata. Springing from theunder side and near the apex of its obliquely ascending stem (Fig. 80, i), is. Fig. 79. Calypogeia ericetorum. Half-dia-grammatic representation of a fertile sac inlongitudinal section, p, mucilage papilla;E, embrjo ; A, nutritive tissue of the stalk,j/, of thearchegonium; A, sterile shading indicates the zone whence growthof the sac chiefly proceeds. Schiffner, Hepaticae, in lingler und Prantl, Die natiirlichen Pflanzenfamilien, p. 70. 92 FERTILE SHOOTS IN HEPATICAE a thick, fleshy, brownish body upon the outer side of which I found but fewrhizoids. It appears to me, from an examination of dried specimens, doubt-ful if this sporogonial shoot is really pushed into the soil. It is possiblethat it bends down the plant by its weight ; this, however, can only be deter-mined by the examination of living plants, In the juvenile stages t/icje is no sac only a solid flesJiy body upon thesummit of which there are a number, abouttwenty, of archegonia. The archegonia arefound, as a co
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