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This species sparkles in the breeze like the waters of an agitated pool in strong sunlight. It is our commonest slime mold, and is to be found late in the fall on decaying sticks and logs far and wide. Enlarged 40 diameters.

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COMATRICHA PULCHELLA IS PROBABLY WIDELY DISTRIBUTED BUT IT IS RARELY COLLECTED

The sporangia of this species are very minute, being less than one-twentieth of an inch high. Magnified 30 diameters.

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BEAUTIFUL DIDERMA TESTACEUM IS FOUND THROUGHOUT THE UNITED STATES

Most of the specimens of this slime mold in our Western States are found on dead oak leaves; in the East, they not infrequently
gather on moss. When fresh this Diderma is easily recognized by its delicate pink color. Older specimens become white. Enlarged
40 diameters.

National Geographic Society Painting from life by William Crowder The spherical sporangia on slender stalks are like tiny baskets, the ribs and stays of which are represented by a latticelike wall of strange diametric design. The spores, a rich cinnamon brown oftentimes reddish in color, at first fill the little baskets to capacity, but eventually they make their escape through openings in the wall. At every slightest breath of air the baskets sway and jostle, strewing their burdens, pepper-box fashion, in all directions. This is Dictydium cancellatum, magnified 40 diameters.

WONDROUSLY WROUGHT DETAILS DISTINGUISH THESE ORNATE STRUCTURES

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ARCYRIA FERRUGINEA, ENLARGED 18 DIAMETERS

Painting from life by William Crowder

National Geographic Society Groping, streaming, pulsating, the silvery protoplasm of the Arcyria family of slime molds shoots its ghostly threads from moisture-laden logs and wanders over the bark to its place of development into one of the loveliest of natural wonders in miniature.

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