. A monograph of the Mycetozoa, being a descriptive catalogue of the species in the herbarium of the British Museum. Illustrated with seventy-eight plates and fifty-one woodcuts. Myxomycetes. 4; INTRODUCTION. be distinguished from the rest of the hyaline element, and appear to contain refuse matter. After a time the creepmg movement is again exchanged for the dancing. In all cultivations of germinating spores, a number of the swarm-cells, after a snort period of activity, withdraw the flagellum and become encysted in a globular form, as the Tnicrocysts of Cienkowski. After being dried and re-w
. A monograph of the Mycetozoa, being a descriptive catalogue of the species in the herbarium of the British Museum. Illustrated with seventy-eight plates and fifty-one woodcuts. Myxomycetes. 4; INTRODUCTION. be distinguished from the rest of the hyaline element, and appear to contain refuse matter. After a time the creepmg movement is again exchanged for the dancing. In all cultivations of germinating spores, a number of the swarm-cells, after a snort period of activity, withdraw the flagellum and become encysted in a globular form, as the Tnicrocysts of Cienkowski. After being dried and re-wetted, the contents bursts the membranous cyst-wall, which remains as an empty hyaline sac, and emerges to resume the swarm-cell form. If bacteria are introduced into a cultivation of swarm-ceUs on the stage of the microscope, they are seen to be laid hold of by the pseudopodia and drawn into the body of the swarm-cells, where they are enclosed in a digestive vacuole. Several bacteria are brought in turn to the same chamber, or fresh captures are conveyed into one or more additional vacuoles. The protrusion of pseudopodia usually ceases after such ingestion, and that part of the swarm-cell takes a rounded form. In the course of an hour or two the bacteria are assimilated, and the digestive vacuoles dis- appear. Unicellular algse and inorganic matter are sometimes taken in, which after a time are again discharged. Both ingress and egress are observed to take place only at the posterior end.* De Bary stated that swarm-cells derive their sup- port only from nutrient matter in solution,t and it may be that they are to some extent nourished in this manner;. Fig. 2.—^Amauroch^te atea Rost. a to/. Successive stages 'in bipartitioii of swarm-cell, accompanied by the division of the but Considering the large num- nucleiTS by karyokinesis. Magnified 1200 titnes. i p •ui" i. Drawn from stained preparations in Canada Der Ot specieS belonging tO ^''^™- difEerent genera which have
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectmyxomyc, bookyear1894
