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Species Information
Summary: Features include small, blackish, cup-shaped to disc-shaped fruiting bodies that are pruinose on the inner and outer surface, growth on pine bark, and microscopic characters. This is not the same as Godronia pinicola (Reb.)Karst.; Groves(3) in his monograph on Godronia gives Atropellis pinicola Zeller & Goodd. as the correct name for Godronia zelleri Seaver.
Atropellis pinicola is found from OR to CA, MT and BC, (Seaver). Collections were examined from BC, WA, OR, ID, (Reid, J.).
Upper surface: 0.2-0.4cm wide, at first closed, opening by star-shaped or irregular clefts, leaving rather fimbriate [fringed] margins, expanding to disc-shaped, "usually rolling up from two sides when drying"; black; pruinose
Underside: external surface black to fuscous black; pruinose
Stem: without stem, or on very short central stem
Microscopic: spores 36-63 x 1.5-3.5 microns, filiform [thread-like] to acicular-clavate [needle - club-shape], colorless, continuous, guttulate; asci 8-spored, 74-178 x 8-13 microns, clavate, colorless, staining brown with iodine; paraphyses exceeding the length of the asci by 32-38 microns, hair-like, flexuous [wavy], "tips slender, agglutinated, forming a dense epithecium with rosy and purplish tints in section", (Seaver(2)), spores 32-63 x 1.5-3.5, filiform to acicular-clavate, colorless, 1-6-celled; asci 74-178 x 8-13 microns, (Reid, J.)
Habitat / Range
single or gregarious, erupting from outer layers of bark on living branches of Pinus lambertiana, Pinus monticola, Pinus strobus, and Pinus contorta
Similar Species
Atropellis pinicola is easily distinguished from other Atropellis species on pine because of its long narrow spores: Atropellis piniphila has spores (14)16-28(32) x 4-7(8) microns, "elliptic-fusoid, with acute ends, straight or sigmoid, (0) to 1-septate (rarely becoming 3-septate)", and asci (85)90-160 microns, (Reid, J.).
