Fluted Bird's Nest (Cyathus striatus)
Or in this case a log pile …
The funnel-shaped fruitbodies of C. striatus are always a pleasure to find. However, although often clustered in large groups, they are easily overlooked because they are small and inconspicuous and because their habitat is typically dark, damp woodland.
They initially form as light-brown hairy inverted cones on decayed hardwood or woody debris. With age they become darker and a white protective membrane, the epiphragm, appears and opens, exposing a hollow interior containing a small number of silver-grey egg-like spore cases, or peridioles. Each peridium [nest] typically contains four or five flattened peridioles [eggs]. Whilst the outside of a peridium is covered with grey-brown to orange-brown hairs, the inner surface is hairless but fluted [striated] vertically - referred to in both the common name and the specific epithet. The peridia grow to around 15 to 20mm in height and 6 to 10mm in diameter with a steady taper outwards towards the rim. The individual peridioles are characteristically 1 to 2mm across.
My thanks to Nick Aplin of the Sussex Fungus Group who kindly supplied the above photomicrograph showing the basidiospores.
Buczacki, S., Shields, C. and Ovenden, D. (2012). Collins Fungi Guide: The most complete field guide to the mushrooms and toadstools of Britain & Ireland. London: HarperCollins, p. 442, fig. p. 443.
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