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Coprinus comatus
This mushroom appears to be the Shaggy Ink Cap. The cap was 8 cm long and the underside gills were already black, as in a mature specimen. However, this one did not dissolve in inky goo, but rather rolled up, inside-out into a disk of black gills around the top portion of the cap. In looking at pictures of Coprinus comatus, it seems that some specimens do roll up instead of dissolving (http://www.alamy.com/stock-photo/ink-cap...). The self-digestion/rolling-up process is also a way of releasing the spores over a longer period of time, and allowing the release of spores from very closely spaced narrow gills borne inside a longitudinally tall pileus. The capped form was seen on the 23 of June, while the disk form was seen the following day on the 24th.
This mushroom was by itself in a grassy plot near trees within the grounds of the Hotel Bosques del Sol, San Cristobal de Las Casas, Chiapas, Mexico.
These mushrooms are edible when still young (when the gills are white or pink in color). As a fascinating aside, new studies have shown that the Shaggy Ink Cap, while saprophytic is also carnivorous, feeding on soil nematodes. The roots or hyphae produce sharp burr-like growths which wound and envenom any nematode which brushes against them, then envelopes the worm in hyphae to digest it (http://hubpages.com/education/The-Shaggy...). See also: http://www.mushroomexpert.com/coprinoid..... https://en.wikipedia.org/wiki/Coprinopsi... And see this great explanation of the systematic problems that have occurred within the Ink Cap Mushrooms (http://botit.botany.wisc.edu/toms_fungi/...).
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