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The North American Slime-Moulds
A Descriptive List of All Species of Myxomycetes Hitherto Reported from the Continent of North America, with Notes on Some Extra-Limital Species

written by "MacBride, Thomas H. (Thomas Huston)"
...arians Sommf., Rost., Mon., p. 134. 1892. Fuligo varians Sommf., Macbr., Bull. Lab. Nat. Hist. Ia. II., p. 160. 1894. Fuligo septica (Linn.) Lister, Mycetozoa, p. 66. 1899. Fuligo ovata (Schaeff.) Macbr., N. A. S., p. 23. 1911. Fuligo septica Gmel., Lister, Mycetozoa, 2nd ed., p. 86. This remarkable and universal species presents as stated many forms and phases. Of these five have been selected as representative. 1. Form a. Plasmodium yellow; cortex yellow, or orange-brown, strongly calcareous friable; form indefiniteF. ovata 2. Form b. Cortex less calcareous porose, yellowish brown, fructification definite, pulvinateF. rufa 3. Form c. Cortex smooth, persistent; fructification small, less than two inchesF. laevis 4. Form d. Plasmodium yellow; cortex none; capillitium yellow, fructification thin, sometimes wide-spreadF. flava 5. Form e. Plasmodium violaceous, dark; cortex almost none; whole mass reddish or violetF. violacea 1. Form a. Fuligo ovata (Schaeff.) Pers. Plasmodium bright yellow; thalium pale brown, or yellowish-ochraceous, of variable size and shape, one to many cm. in diameter, and one to two cm. thick, enclosed by a distinct calcareous crust,[Pg 28] which varies in texture, thickness, and color; capillitium well developed but variable in color, form, and extent; spore-mass dull black, sooty; spores spherical, purplish brown, nearly smooth, 7–9 . Under this name may be placed our most common form. Rising with an abundant yellowish creamy plasmodium from masses of decaying vegetation, lumber, sawdust, half buried logs, it creeps about with energy unsurpassed, coming to rest only in some position specially exposed, as the top of a log or stump, the face of a stone or post, or even the high clods of a cultivated field! The fructification is large, yellow, or at most pale ochraceous, the surface when mature extremely friable like dry foam. Bulliard figures this phase well on Plate 424, Fig. 2, and calls it Reticularia (Fuligo) horte...

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