. Dansk botanisk arkiv. Plants; Plants -- Denmark. 342 Dansk Botanisk Arkiv, Bd. 3. Nr. 1. dense tufts. Its flat, leaflike thallus is thin, consisting, with the ex- ception of the midrib, of only a single layer of cells; it is repeatedly forked and narrowed at each ramification, the internodes, on account of this narrowing, being lanceolate. One of the flat sides of the thallus is turned upwards, the other downwards against the sub- stratum. From the side turned down rhizoids are issued at the fork- ings of the thallus (Fig. 338). Small epidermal cells are cut ofl" from a group of central
. Dansk botanisk arkiv. Plants; Plants -- Denmark. 342 Dansk Botanisk Arkiv, Bd. 3. Nr. 1. dense tufts. Its flat, leaflike thallus is thin, consisting, with the ex- ception of the midrib, of only a single layer of cells; it is repeatedly forked and narrowed at each ramification, the internodes, on account of this narrowing, being lanceolate. One of the flat sides of the thallus is turned upwards, the other downwards against the sub- stratum. From the side turned down rhizoids are issued at the fork- ings of the thallus (Fig. 338). Small epidermal cells are cut ofl" from a group of central cells at the forkings, cp. Nägeli, 1855, 1. c, p. 73, pi. VIII, figs. 1 and 7. From these cells a bundle of rhizoids grow. Fig. 338. Caloglossa Leprieurii (Mont.) J. Part of a plant. (About 6:1). Ag. out, cohering more or less at their outgrowth, later on separating and spreading out in all directions. By means of these haptera the plant is fixed to the substratum. I have not come across tetrasporangia in my material, but tetra- sporic plants and the structure of the tetrasporangia have been de- scribed by Cramer, 1. c. The tetrasporangia are formed in great number in a single layer in the tissue on both sides of the midrib. In the part of the thallus destined to produce the tetrasporangia the cell-division takes place in a way somewhat diflering from that in the vegetative thallus. The primary marginal cells form only a single row of cells; these cells are later divided into two cells: one above, namely the mother cell of the tetrasporangia, and one below. 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 Dansk botanisk forening. Kbenhavn : Dansk botanisk forening
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Keywords: ., bookcentury1900, bookcollectio, bookdecade1910, booksubjectplants
