Observation 178991: Chaenothecopsis Vainio

on sheltered side at base of big old leaning Robinia pseudoacacia

old open oak-maple forest on west-sloping side-ridge

algae Trentepohlia + Stichococcus, apothecia ~1.0×0.06mm head ~0.5mm wide, head black not mazaediate, stalk dark brown to the eye but pale brownish below to reddish above in squash, hymenium and hypothecium brown K-, spores 8 per ascus ellipsoid ~5-7×2.5um brownish smooth?

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