. The algae. Algae. Fig. 112 Fucus. A-Cj origin of conceptacles in F. serratus. h = basal cell, I = initial. D, juvenile conceptacle of Cystoseira. ^=hair. (After Oltmanns.) Barents Sea F. vesiculosus plants reach their maximum size at the greatest depth for the species (300 cm.). Morphologically the primary thallus is built up by the activity of the apical growing cell (see below) and by the surface layer of cells, the limiting layer or meristoderm. Below the limiting layer is a cortex composed of several layers of parenchymatous cells which become more and more elongate and mucilaginous towa
. The algae. Algae. Fig. 112 Fucus. A-Cj origin of conceptacles in F. serratus. h = basal cell, I = initial. D, juvenile conceptacle of Cystoseira. ^=hair. (After Oltmanns.) Barents Sea F. vesiculosus plants reach their maximum size at the greatest depth for the species (300 cm.). Morphologically the primary thallus is built up by the activity of the apical growing cell (see below) and by the surface layer of cells, the limiting layer or meristoderm. Below the limiting layer is a cortex composed of several layers of parenchymatous cells which become more and more elongate and mucilaginous towards the centre, and these probably form the storage system. In the very centre the cells are extended into hyphae which are interwoven into a loose tangled web, but they do not extend right up to the apex. This central tissue is called the medulla and probably acts as a con- ducting system, because the transverse walls of the hyphae are frequently perforated with the same type of pit that is to be found in some of the Laminariaceae. The primary medullary hyphae are relatively thin-walled, but when secondary growth of the thallus takes place the new hyphae which result from this process are very thick-walled and so are probably mainly mechanical in function. Secondary growth is due to the activity of the Umiting layer and the 199. 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 Chapman, V. J. (Valentine Jackson), 1910-. London, Macmillan; New York, St. Martin's Press
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Keywords: ., bo, bookcentury1900, bookcollectionbiodiversity, booksubjectalgae
