Archive image from page 357 of Dansk botanisk arkiv (1913-1981). Dansk botanisk arkiv danskbotaniskark03dans Year: 1913-1981 350 Dansk Botanisk Arkiv, Bd. 3. Nr. 1. SvEDELius maintains that the cross-beams are given oif rather regularly at nearly the same height, but this holds good only with regard to the young tissue; later on in the older tissue so many new cross-beams are formed at various distance and height that their distribution is quite irregular. Sometimes, but not always the cells of the cross-beams in the older net are divided so that these consist of a few layers of cells just a
Archive image from page 357 of Dansk botanisk arkiv (1913-1981). Dansk botanisk arkiv danskbotaniskark03dans Year: 1913-1981 350 Dansk Botanisk Arkiv, Bd. 3. Nr. 1. SvEDELius maintains that the cross-beams are given oif rather regularly at nearly the same height, but this holds good only with regard to the young tissue; later on in the older tissue so many new cross-beams are formed at various distance and height that their distribution is quite irregular. Sometimes, but not always the cells of the cross-beams in the older net are divided so that these consist of a few layers of cells just as in the case of Martensia fragilis. Fig. 345. Martensia Pavonia J. Ag. Part of the thallus. (About 10:1). Finally in the older net secondary longitudinal beams are formed running nearly parallel to the original longitudinal lamellæ. As a rule they protrude themselves freely (cp. Figs. 345, 346), but it may happen that they reach another similar cell-row and grow together with it. These secondary longitudinal cell-rows were not found in the material examined by Svedelius, but Svedelius asserts that they are found in Martensia flagelliformis with which species Martensia Pavonia therefore agrees in this respect. Tetrasporangia did not occur in the specimens examined by Svedelius. They(Fig. 346) are formed in the oldernet, but I have also I
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