. Botany for agricultural students . Botany. 320 THALLOPHYTES Kelps that much potassium for fertilizers is obtained {Fig. 275). Although the Kelps have massive and complex plant bodies, their reproduction, so far as known, is not so complete as that of some Green Algae. Their reproduction is sexual and the small ciliated gametes are borne in special cells which occur in patches. Fig. 275. — Harvesting Kelp on the Pacific Coast. U. S. Dept. of Agriculture. From Report 100, on the surfaces of the leaf-like branches. The zygospore develops a new plant directly. Ectocarpus. — This form (Fig. 276),
. Botany for agricultural students . Botany. 320 THALLOPHYTES Kelps that much potassium for fertilizers is obtained {Fig. 275). Although the Kelps have massive and complex plant bodies, their reproduction, so far as known, is not so complete as that of some Green Algae. Their reproduction is sexual and the small ciliated gametes are borne in special cells which occur in patches. Fig. 275. — Harvesting Kelp on the Pacific Coast. U. S. Dept. of Agriculture. From Report 100, on the surfaces of the leaf-like branches. The zygospore develops a new plant directly. Ectocarpus. — This form (Fig. 276), although belonging to the same order, contrasts strikingly in size with the Kelps, for it is a slender filamentous form not much larger than some of the Green Algae. This form also shows some interesting features in connec- tion with reproduction which is effected through the production of both zoospores and gametes. The zoospores are produced in certain cells which become trans- formed into sporangia. In forming a sporangium, a single cell within the filament or at the end of a branch usually enlarges and its protoplasm divides up into zoospores. The zoospores bear their cilia laterally and not terminally as in the Green Algae, but function in the same way by growing directly into new 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 Martin, John N. (John Nathan), b. 1875. New York : John Wiley & Sons, Inc.
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