Species of the Month - September 2012
The Tawny Grisette is a common woodland mushroom that forms mycorrhizal associations with a variety of different tree species, both conifers and broadleaves. It is recognised by the tawny-coloured flat cap with striations around the rim, together with the lack of a ring on the stem (as some Amanita sp have) and the orange-brown sack-like volva at the base. This volva is not always as uniformly brown as in these photos, sometimes it is partly white but it always has patches of orange-brown colouring.
In the above picture, bits of veil can be seen adhering to the stem, and the young fruitbody in front has a few bits of veil in the centre of the cap, but this is unusual and the mature cap will not have a covering of veil pieces as seen in Amanita muscaria (Fly Agaric), Amanita rubescens (The Blusher) and various other species.
The most likely confusion species is the Grisette (Amanita vaginata) but this has a grey-brown cap without the warm orange tone of the Tawny Grisette. Also the Grisette has a white volva. Another possibility is Amanita battarrae has a greyish-brown or dull brown cap, often with a ring zone of darker colour, and the volva is white with orange-brown spots or stains.
The BMS database,
currently updated to 2009, has 3,833 records for the Tawny Grisette, but
only 5 of these are from our vice-county. I and other lnhg
mushroom spotters have added another 3 since then so if we get two more
from having it on Species of the Month then we will have doubled the
total and made a start on showing that the gaps in the maps for this and
many other fungi in Argyll are not due to the shortage of fungi but the
shortage of recorders.
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21 Sep: No sightings from Argyll yet but I found some today in a birchwood on Skye
22 Sep: First Argyll
sighting today under birch at Inverawe on Gary Goldie's fungus foray
2012 - Forest Bug