- 1894. Didymium anellus Morgan, Jour. Cin. Soc., p. 64.
- 1899. Didymium anellus Morg., Macbr., N. A. S., p. 85.
- 1911. Didymium anellus Morg., Lister, Mycetozoa, 2nd ed., p. 134.
Plasmodiocarp in small rings or links, then confluent and elongated, irregularly connected together, bent and flexuous, resting on a thin venulose hypothallus, or sometimes globose, the peridium dark colored, with a thin layer of stellate crystals, irregularly ruptured; capillitium of slender, dark-colored threads, which extend from base to wall, more or less branched, and combined into a loose net; columella a thin layer of brown scales; spores globose, very minutely warted, violaceous, 8–9 µ.
This minute species resembles a poorly developed, or sessile, phase of D. melanospermum. Some of the sporangia (?) are spherical; such show a very short dark stalk. The columella is scant, and the spores are smaller than those of D. melanospermum.
Ohio. Reported more recently from Europe and Ceylon.
3. Didymium wilczekii Meylan.
- 1908. Didymium wilczekii Meyl., Bull. Soc. Vaud. Sci. Nat., XLIV., p. 290.
- 1911. Didymium wilczekii Meyl., List., Mycetozoa, 2nd ed., p. 134.
Plasmodiocarpous, dehiscing irregularly, columella scant; capillitium abundant, the threads brown, anastomosing, forming an elastic net; spores purple-brown, minutely spinulose, 10–12 µ.
Resembling plasmodiocarpous forms of D. squamulosum, a montane var.; small and delicate, our specimen about 16 × 6 mm. Evidently not common; collected but once by Professor Bethel at an altitude of 11,000 feet, Rocky Mountains of Colorado.
Reported in Switzerland and Sweden.
In certain Swiss gatherings made in 1913 Miss Lister finds capillitial threads with spiral tæniæ as in Trichia! (Jour. of Bot., Apr. 1914.) The threads in our specimen are roughened, somewhat as in D. squamulosum, though less strongly; the spores are nearly smooth, fuliginous at first, paler and violaceous when saturate.