By Frederick W. Spiegel, John D. Shadwick, Lora A. Lindley, Matthew W. Brown
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Additional resources for A Beginner’s Guide to Identifying The Protostelids
From some angles, 4-spored sporocarps may be difficult to distinguish from the smaller P. conicum because of the difficulty of seeing whether there is a distinct basal, obconic spore as in P. conicum or a sporangium with no one clearly basal spore as in P. articulatum. Also, P. conicum lacks the stalk articulation. Care must be taken because both species cofruit. Spores multiple, stalks long A B Protosporangium bisporum Olive & Stoianovitch This very uncommon protostelid is likely to be found on bark of living trees Stalk: very long, thin, and flexuous though rarely sharply bent with pointed angles.
Spores multiple, stalks short SH SH A B C Echinosteliopsis oligospora Reinhardt & Olive This common species is treated as short stalked because it is usually first observed on PIP with a hydrated sheath that makes the diameter of the sporangium greater than the length of the stalk. Stalk: straight to gently curved with a pronounced taper from base to tip. Spores: 1-8, usually 4, spherical to laterally compressed, usually of different sizes within a single sporangium, spore walls smooth within a hygroscopic sheath that is usually hydrated in the saturated air of a culture plate.
Its distinctive spores make it easy to recognize. Stalk: relatively longer and usually more gracile and finely tapered than that of S. vulgare. The two sporocarps marked with arrows in Fig. B show stalks whose bases are not blocked by the substrate such that their whole length is obvious. Spore: essentially spherical with a distinct, raise reticulum of ridges that is easily visible even at low magnifications (arrows, Fig. A-C). Prespore Cell (PSP): not shown, round in outline. Scale bar: 100µm, A,B: 50µm C.