Observation 200661: Deconica rhomboidospora G.F. Atk.
When: 2015-03-18
No herbarium specimen
0 Sequences

Growing in mosses over red clay, next to glen .

Cap – Largest is 1.7 cm diameter. Cap shape is ovate. Cap is smooth, striations at edge caused by gills. Even smallest does not show Partial Veil. Cap lighter at top.

Stipe – Much longer than cap is wide ( variable ), fibrous, thin, uniform width. I could see a small bit of mycelium at the base.

Gills – Brown like cap. Adnate. Subdistant to Distant, deep. Distant complete gill with several shorter partial gills between.

Spore Print – Looked black but might be very dark brown-purple.

Staining – no change of color with cut or bruised.

Odor – mild mushroom

Spore Sizes – Description
Ellipsoid, Smooth, Thick-walled, Apical pore,

[20/1/1] L (-5.5) 6.1 – 7.1 (-) μm x W (-3.7) 4.2 – 4.8 (-4.9) μm, (L = 6.6 μm, W = 4.4 μm), Q (-1.35) 1.42 – 1.58 (-1.60), Q = 1.50 Ellipsoid

Microscopic features – It was difficult to see details as everything was covered by dense layers of spores. I could only tell that the pileus was not cellular and had no gelatinized material.

I could see filiform Cheilocystidida a the gill tip. See image.

It appeared the basidia held 4 spores.


1000x mag :Cheilocystidida
1000x mag :Cheilocystidida
1000x mag :Cheilocystidida
1000x mag :
1000x mag :
1000x mag :

Proposed Names

-33% (2)
Used references: internet, mushroom expert, Rogers
Based on microscopic features: spore size
45% (2)
Recognized by sight: looks like one of the non-bluing species formerly included in Psilocybe (= now called Deconica
57% (1)
Recognized by sight: An eastern species. Macroscopic descriptions match.
Used references: The Genus Psilocybe by Gaston Guzman – Pages 78 and 153
Based on microscopic features: Spore size, shape, wall and the elongated tips of the cheilocystidia match.

Please login to propose your own names and vote on existing names.

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Angular Spore Measurement
By: L G Price (LG_Price)
2015-03-21 11:36:00 PDT (-0700)

Also, I’ve never seen a protocol for measuring angular spore. My method is to fit an ellipse around a spore, getting a good fit and then I use the major and minor diameters as length and width. At least what I do is fairly consistent.

By: L G Price (LG_Price)
2015-03-21 11:32:16 PDT (-0700)

Thanks for posting the description.

I can interpret about 60-70% of it.

I think I need to go back and collect more in the next few days, if it will stop raining. Then I need to wash away as many spore as possible and try to get better images of the gill features.

The biggest mis-match I see is evidence of a Partial Veil. I looked for this in the smallest buttons and saw nothing. Perhaps I am not recognizing the remnants.

I want to submit vouchers for this one for the North American Mycoflora Project and think it will take more material that the 2-3 that I collected previously. These are very small and become small indeed when dried. Hopefully, if I can collect 6-8, that will be enough for extracting DNA.

Guzman’s description indicates the spores are
By: Ron Pastorino (Ronpast)
2015-03-21 10:45:13 PDT (-0700)

rhomboid to subrhomboid. The line drawings appear to show more angular spores than what you show, but other features seem close.
Earlier name was Psilocybe phyllogera, meaning “growing on leaves”.
Here is part of the description from Guzman’s paper;

“51. Psilocybe phyllogena (Peck) Peck Bull. N. Y. State Mus. 151: 99, 1912.
Figs. 302-319 & 773
Agaricus(Hyph%ma) phyllogenus Peck, Ann. Rep. N. Y. Stale Mus. 26: 60, 1814.
A. (Hyph%mo) modestus Peck,lbid 11: 29, \879.
Hyph%ma phyllogena (Peck) Sacc., 5)’11. Fung. 5: 1042, 1887.
H. modesto (peck) Sacc., Syll. Fung. 9; 139, 1891.
Agaricus rhombisporus Britz., Rev. Hym. 3: p. 16, 1899.
Psifocybe rhombispora (Britz.) Sacc., Sy/l. Fung. J I: 72, 1895.
Psathyra conicu Peck, Ann. Rep. N. Y. Stale Mus. 54: 153, 1901 .
S/ropharia rhombispora HOhnel, Ann. Myc. }: 393, 1903.
Psilocybe phyl/ogena f. modesto Peck, Bull. N. Y. State Mus. 157: 99, 1912.
P. sphagnico/a Smilh, Jour. Elisha Mitch. Sc. Soc. 62: 197, 1946.
P. modestus{Peck) Smith, Mycofogia 40: 700, 1948.
Deconica rhombispora (Brilz.) Sing., Lilloa 22: 509, 1949.
Geophi/a rhombispora (Brilz.) KUhn. & Romag., Fl. anal. chomp. sup., p. 338. 1953.
Pileus (4-) 10-15 (-22) mm diam., conic to convex, or conic-campanulate, or
subumbonate, then expanding to slightly umbonate, glabrous, except for white
patches or flocculent fibrils of the evanescent veil remnants adhering at first along
the margin in young specimens, surface even but margin slightly striate when moist,
viscid or subviscid when moist, hygrophanous, dark reddish brown or brownreddish,
fading to pale ochraceous, pale chestnut-color, ochraceous buff, or
brownish yellowish when dry.
Lamellae broadly adnate to somewhat subdecurrent, pale grayish brown, becoming
dark purple-brown, chocolate-brown, or violaceous brown, with white or whitish
and slightly crenulate edges.
Stipe (20-) 30.60 (-90) X )-1.5 (-2.5) mm, flexuous, equal or slightly subbulbous,
stuffed or hollow, silky fibrillose, brown or brownish to straw-color , covered by
dense whitish fibrils from the veil, sometimes expanding at the base into a thin flat
disc which adheres closely to the substratum.
Veil poorly developed, as whitish flocculent fibrils in the young specimens, which
soon disappear in the adult stages.
Context moderately thick (1-3 mm thick) at the pileus (in specimens 10-15 mm
diam.), pliant and brownish or reddish brown, both in pileus and stipe. Taste mild.
KOH stains both pileus and stipe brown dark.
Spore print dark chocolate brown.
Spores (5.5-) 6-7 (-10) x (4.5-) 5-5.5 (-7) x (3.8-) 4.4-5 tJrn, rhomboid or subrhomboid
in face view, subellipsoid in side view, dark yellowish brown, thick walled
(more or less I tJm thick), and with a broad germ pore. In some specimens abnormal
spores can be observed with two pores or with a distinct heart shape.
Basidia (14-) 19-28 × 5-6.6 tJrn, 4-spored, rarely 2-spored with sterigmata up to
2 tJm long, hyaline, ventricose-subcylindric. or ventricose-subpyriform, often with a
median constriction, sometimes with a clamp connection at the base.
Pleurocystidia absent.
Cheilocystidia 22-35 (-37) x (3-) 4.4-6 (-7) ,Urn, abundant, forming a sterile band,
hyaline, narrowly ventricose-fusoid. sublageniforrn, lageniform or subfiliform,
with a flexuous neck 2.2-3.5 ,Urn diam., often with an adhering viscous hyaline
globule at the apex.
Subhymenium subcellular..”

Rhomboid shape?
By: L G Price (LG_Price)
2015-03-20 12:49:52 PDT (-0700)

The best answer is that I don’t know.

However, when I was looking at the spores in the microscope, I remember thinking that some of them had an “almost” rhomboid shape. I was just trying to measure the spores and I didn’t try to photograph one of the more angular ones. Most were pear-shaped. I just now looked through the photos I took for measuring and found one with a spore that was a little more angular. I added that image to the observation.

Not having a copy of the Guzman paper,
By: Ron Pastorino (Ronpast)
2015-03-20 07:44:03 PDT (-0700)

I have to ask the obvious question; Why doesn’t D. rhomboidospora have rhombic spores ?

Species ID -
By: L G Price (LG_Price)
2015-03-19 17:45:37 PDT (-0700)

Thanks and especially for the detailed information.

Deconica ID – Thanks
By: L G Price (LG_Price)
2015-03-18 11:03:42 PDT (-0700)


Created: 2015-03-17 23:12:22 PDT (-0700)
Last modified: 2015-03-20 12:45:26 PDT (-0700)
Viewed: 231 times, last viewed: 2017-09-10 08:20:00 PDT (-0700)
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