. Bulletin. Natural history; Natuurlijke historie. 60 PEABODY MUSEUM BULLETIN 25 25m. n / lOM B lOiJ Text-fig. 5. Special cell types and coiled material in Thalysias schoenus. A. Toxoblast contain- ing a toxa. B. Coiled material, n = nucleus. C. Cell type S containing basophilic (black) and Mallory-positive (white) inclusions, n = nucleus. D. cell type G-R containing basophilic (black) granules and a single rod-shaped Mallory-positive inclusion. lory solution IL These cells occur quite commonly in groups at the base of tufts of styles in the differentiated areas. These cells are usually elonga
. Bulletin. Natural history; Natuurlijke historie. 60 PEABODY MUSEUM BULLETIN 25 25m. n / lOM B lOiJ Text-fig. 5. Special cell types and coiled material in Thalysias schoenus. A. Toxoblast contain- ing a toxa. B. Coiled material, n = nucleus. C. Cell type S containing basophilic (black) and Mallory-positive (white) inclusions, n = nucleus. D. cell type G-R containing basophilic (black) granules and a single rod-shaped Mallory-positive inclusion. lory solution IL These cells occur quite commonly in groups at the base of tufts of styles in the differentiated areas. These cells are usually elongate but some are spherical in shape; they con- tain anucleolate nuclei. No mitotic figures have been found in them. Cell type S These cells are present in the mesenchyme and show movement without the formation of pseudopodia (PI. 14, fig. 2). They contain spherical, cytoplasmic inclusions some of which stain light blue in Mallory solution II and others of which stain basophilically (Text-fig. 5, C). Some cells contain a predominance of Mallory-positive inclusions; others contain approximately equal numbers of both Mallory-positive and basophilic inclusions. These cells are spherical and contain anucleolate nuclei which give the appearance of being crenated. No mitotic ac- tivity has been found in these cells. Toxoblasts Toxoblasts are elongate in T. schoenus (Text-fig. 5, A). The cytoplasm is relatively homogeneous but does contain a few small inclusions and granules. Nuclei are elongate and anucleolate. Those toxoblasts which contain a toxa within them are usually longer and thinner; they have not been observed to move actively in the mesenchyme or to undergo division. De Laubenfels (1936, p. 101) has described the presence of "slipper-shaped, enucleate cells about 4/a by 12jLi" in schoenus. He refers to these cells as blue-green algae. Toxoblasts have the same shape as these slipper-shaped cells and from my examination of de Laubenfels specimen (see p. 56) it seems e
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