Organography of plants, especially of the archegoniatae and spermaphyta . Fig. 145. Polypodium seen from below. On themargin are bristle hairs and rhizoids,IVh. On the surface two groups ofarchegonia surrounded by rhizoids. Itis only at the points where these groupsare that the prothallus is Fig. 146. Apex of a band-like prothallus with bristle hairs. Oneof these bristle hairs shows a spiral line of rupture the result of swellino-in potash solution. Highly magnified. their free propagation by gemmae which will be presently mentioned ^ mayalso be co
Organography of plants, especially of the archegoniatae and spermaphyta . Fig. 145. Polypodium seen from below. On themargin are bristle hairs and rhizoids,IVh. On the surface two groups ofarchegonia surrounded by rhizoids. Itis only at the points where these groupsare that the prothallus is Fig. 146. Apex of a band-like prothallus with bristle hairs. Oneof these bristle hairs shows a spiral line of rupture the result of swellino-in potash solution. Highly magnified. their free propagation by gemmae which will be presently mentioned ^ mayalso be connected with this pro- thf^ ,?; ^R l/?! ? Fjhcineae at different stages of development, i, Hvmenolepis spicata. Young pro older nrnd^? f ^1= ^^j °^ .= ^P£f. J, two-sided apical Cell cut off the oblique walls. //, /;. 2. aimar^.n r wH, ,^^V? undetermined . The two-sided apical cell is .iivided bv a poriclinal wall which initiatesmagmfied^ 3 and 4, Asplenium Nidus. ^, end-cell of the prothallus, thb meristem arises laterally. All Prothalli of Polypodiaceae with Heart-like Outline. The prothallus, with heart-like outline, of the majorit}- of the Polypodia-ceae does not always develop in the same manner. In germination thecell-filament is first formed from the spore. Its length depends upon See p. 214. 202 CONFIGURATION OF THE PROTHALIUS OF PTERIDOPHYTA
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