. The algae. Algae. Fig. 86 Myrionema strangulans. A, young plant ( x 640). B, plurilocular sporangia ( x 340). C, unilocular sporangia ( x 340). D, ii-day-old plant from zoid of unilocular sporangium ( x 336). (After KyHn.) gested that some of the other species placed in the genus or in aUied genera may have isomorphic alternation in which case they may need to be removed to the Ectocarpales. Spermatochnaceae: Spermatochnus {sperma^ seed; chnus^ fine down). Fig. 87 This is essentially one of the corticated types, the filamentous, cyUndrical, branched thallus being derived from a central axis
. The algae. Algae. Fig. 86 Myrionema strangulans. A, young plant ( x 640). B, plurilocular sporangia ( x 340). C, unilocular sporangia ( x 340). D, ii-day-old plant from zoid of unilocular sporangium ( x 336). (After KyHn.) gested that some of the other species placed in the genus or in aUied genera may have isomorphic alternation in which case they may need to be removed to the Ectocarpales. Spermatochnaceae: Spermatochnus {sperma^ seed; chnus^ fine down). Fig. 87 This is essentially one of the corticated types, the filamentous, cyUndrical, branched thallus being derived from a central axis com- posed of a single filament with a definite apical cell. Each individual cell of this filament segments at one end and so definite nodes are formed. The corticating filaments arise from the nodes, and growth of the cortex is secured by tangential division of the primary corti- cating cells, though later more filaments may grow on top of them. The outermost layer of the cortex bears the assimilatory filaments and hairs. As the plants become older mucilage develops internally and forces the cortex away from the primary central filament al- though a connexion is maintained by the threads from each node. Unilocular sporangia, together with clavate paraphyses, develop in sori, the sporangia arising from the base of the sterile threads. The 157. 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
