. The algae. Algae. 154 THE ALGAE known. When this genus comes to be investigated it will probably be found to have a life history similar to that of the other Meso- gloiaceae. Corynophlaeaceae: Leathesia (after G. R. Leathes). Fig. 84 The present genus provides an example of degeneration in the cable type of construction. The young plant arises from a small, creeping, rhizomatous portion and is composed of a packed mass of. Fig. 84 Leathesia dijformis. A, plants on Furcellaria fastigiata. B, [ transverse section to show thallus construction ( x 24). C, unilocular sporangia ( x 336). D, pluril
. The algae. Algae. 154 THE ALGAE known. When this genus comes to be investigated it will probably be found to have a life history similar to that of the other Meso- gloiaceae. Corynophlaeaceae: Leathesia (after G. R. Leathes). Fig. 84 The present genus provides an example of degeneration in the cable type of construction. The young plant arises from a small, creeping, rhizomatous portion and is composed of a packed mass of. Fig. 84 Leathesia dijformis. A, plants on Furcellaria fastigiata. B, [ transverse section to show thallus construction ( x 24). C, unilocular sporangia ( x 336). D, plurilocular sporangia ( x 336). (A, after Oltmanns; B-D, after Newton.) radiating, dichotomously branched filaments which are sufficiendy closely entwined to make the plant mass solid. From these medul- lary filaments there arises a cortex of densely packed assimilatory filaments from which occasional colourless hairs emerge. The young plants are subspherical at first, but with increasing age the central medullary filaments commence to disintegrate and as a result the mature thallus becomes hollow and irregularly lobed. Plurilocular and unilocular sporangia are known, the zoospores from the ovoid unilocular sporangia germinating to disc-like plantlets on which plurilocular gametangia ultimately appear. These plantlets either give rise to other similar plandets or else to the adult thallus once more. By analogy with other species the. 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
