By Frederick W. Spiegel, John D. Shadwick, Lora A. Lindley, Matthew W. Brown
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Additional info for A Beginner’s Guide to Identifying The Protostelids
Stalk: very short, wide, with a cup-like apophysis that occupies one third to more than one half the total length of the stalk. Spore: spherical, roughened in appearance by the presence of numerous spines and warts on the spore wall (Fig. C). This spore wall sculpturing often makes the spores appear to be less refractile than those of other protostelids. Some spores may contain two cells in some isolates. Such spores look ellipsoid from above and from the side. Prespore Cell (PSP): not shown, circular in outline.
It lacks both a columella and a capillitium, and the arrangement of spores is unlike any myxomycete when the sheath dries down. In addition the spores usually vary in size within the sporocarp, and they lack any spore wall sculpturing. Spiegel has seen an aggregative ciliate that produces a sorocarp that looks similar to this species on one occasion. Ciliated cells germinate from the undescribed ciliate while amoebae germinate from E. oligospora. Spores multiple, stalks short C B A Microglomus paxillus Olive & Stoianovitch This is a relatively uncommon species of protostelid which is hard to identify if not observed carefully.
Often, the hygroscopic sheath is swollen when hydrated when culture plate is first opened (SH in Fig. B). Prespore Cell (PSP): not shown, circular in outline. Scale bar: 100µm, A, B, D; 50µm, C. Comments: This little myxomycete is found on all kinds of substrates where protostelids are found. It may be a bit more common in the tropics than in temperate areas. Orignially described as Cavostelium bisporum Olive & Stoian. Similar species: None, this species is unique and nearly impossible to misidentify.