When: 2014-06-26

Collection location: Salt Lake City, Utah, USA [Click for map]

Who: Chris Kleine (ckleine)

No specimen available


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Thanks, Byrain
By: Chris Kleine (ckleine)
2014-06-28 18:55:18 CDT (-0400)

Most of the spores lacked guttules, so you could be right about P. castaneifolia. I will review some more material. Thanks for the key!

By: Byrain
2014-06-28 12:10:09 CDT (-0400)

Most spores with or without 1-2 guttules? Since you have a microscope, you should consider P. castaneifolia too.

Here is the Panaeolina key:

1 Spores normally with 1 to 2 big oildrops (also at
exsiccatum); nearly cosmopolitan species
……………………………….. Panaeolina foenisecii (30)
- Spores normally without oildrops ………………………… 2
2 Breadth of spores not more than 10 Lim, ornamenta
tion like foenisecii; basidia constantly 4-spored; robust
Northamerican species Panaeolina castaneifolia (31)
- Breadth of spores up to 12 Lim, ornamentation more
coarsely as foenisecii; basidia 1- to 4-spored; Indian
species …………………………….. Panaeolina indica (32)

Here is a translated description from Gerhardt’s monograph.

(31) Panaeolina castaneifolia (Murrill) Ew.Gerhardt, comb. nov.
Basionym: Psilocybe castaneifolia Murrill, Mycologia 15: 17 (1923).
- Panaeolus castaneifolius (Murrill) AHSm., Mycologia 40: 685 (1948).
- Psathyrella castaneifolia (Murrill) AHSm., New Mem York Bot Gard, 24: 33 (1972).
- Gerhardt described the need for more collections of little known rare American Panaeolus in order
to verify the consistency of the minimal (or perhaps variable) distinguishing microscopic features.
- Based on the single type collection (albeit with abundant material), Gerhardt affirmed that P.
castaneifolia represented a separate taxon from European collections of Panaeolina foenisecii.
- Reported occasionally from Europe (Breitenbach 1979 Krieglsteiner 1981) refer to Panaeolus
castaneifolius (“Murrill”) sensu Ola’h = Panaeolus olivaceus FHMøller.
DESCRIPTION (Translated from Gerhardt 1996, description according to original diagnosis, MURRILL
- Cap 2-4 cm broad, convex shape, not fully expanded
- rather fleshy
- often wrinkled
- margin even and rolled
- strongly hygrophanous
- dark soot brown color when damp
- pale ocher when dry
- often zoned
- flesh soot brown when moist, pale when dry
- with fairly strong odor and unpleasant taste
- gills attached, broad, rounded
- pale to dark reddish brown or chestnut brown, with white edge
- Four-spored
- approximately 28-40 × 9.5-11 microns
- epicutis cells described as larger on average than those of P. foenisecii
- pileipellis cellular, cells approximately 25-35 microns wide
- Measurements from Type Material: spores 13-17 (19) x 7.5-9 (10) microns
- slender lemon-shaped
- distinctly roughened
- not flattened
- usually without oil drops
- germ pore usually not brought forward
- absent
- hyaline
- capitate, bottle-shaped
- approximately 30-40 microns long
- along roadsides, in grass
- Isotype from USA, New York. Botanical Garden, Earle 1442, 14.6.1903 (NY).
- So far known only from the type locality in the United States
- Panaeolina castaneifolia is microscopically very similar to Panaeolina foenisecii. However,
according to MURRIIL’S description the disposition is decidedly thicker. Even in dried preserved
material, it is still clearly visible that the caps are considerably thicker and meatier.
- Whether the striking smell described in the literature is typical, can only be confirmed by further
fresh collections.
- Microscopically, P. castaneifolia has pilepellis cells that are on average larger and more consistently
4-spored basidia. Also the lack of oil drops in the slightly more slender spores, as well as a germ
pore that is not significantly brought forward, may aid in delimitation. Nevertheless, the very slight
microscopic differences are visible only in direct comparison.
- Panaeolina indica has more coarsely ornamented, wider spores.

Created: 2014-06-28 12:04:42 CDT (-0400)
Last modified: 2014-06-28 12:05:16 CDT (-0400)
Viewed: 62 times, last viewed: 2019-09-03 09:49:30 CDT (-0400)
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