Observation 68675: Psilocybe caerulescens Murrill

When: 2011-06-04

Collection location: Las Casas de la Selva, Patillas, Puerto Rico, USA [Click for map]

Who: patty (patty)

No specimen available

Clustered on sandy clay in fairly open area at edge of Pines.
Cap 60-70mm, umbonate, smooth, distinctly hygrophanous, margin striate, incised, context thin, cream, bruising blue only slightly where the stipe meets the cap.
Gills medium gray brown, close, paler at margin.
Stipe central to slightly eccentric, wider at base, 75-84mm long, 3-4mm wide at apex, 4-6mm wide at base, inserted about 20mm, white scurfy towards base, hollow, fibrillose, NOT snapping when bent, ring not present, bruising blue only slightly at apex.
Taste bitter.
Spore print dark purple brown, Spores 5-5.5µm x 6.5-7.5µm, thick walled.

Species Lists


Slight blue bruising at stipe apex
1000x, 5-5.5µm x 6.5-7.5µm
my attempts to find cystidia.
my attempts to find cystidia.
my attempts to find cystidia.

Proposed Names

2% (3)
Recognized by sight: Slight bluing, Purple/brown spore print
Based on microscopic features: spore shape/size
37% (2)
Recognized by sight: Large blue staining Psilocybe in sandy soil, bottom of stem with floccose mycelium
Based on microscopic features: Spore size and shape. Please post pics of pleurocystidia and cheilocystidia if possible.
Based on chemical features: Staining blue
12% (3)
Based on microscopic features: Check for abundant pleurocystidia

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

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
By: patty (patty)
2011-06-06 23:16:56 CEST (+0200)


By: Alan Rockefeller (Alan Rockefeller)
2011-06-06 21:03:45 CEST (+0200)

The cheilocystidia is easy, just take a gill and look at the edge. Should be very abundant. I think you are sectioning properly to find pleurocystidaia, using a transverse section of the cap. I am not sure that what you have there is pleurocystidia – could be though. Some descriptions of P. caerulescens list it as having pleurocystidia and others list it as absent. After checking a lot of Mexican material I have seen it a few times – There are never very many and they are deeply buried in the gill. Very cool collection! If you see it again please get some more pics of the stem, as they are rather distinctive in this species.

trying to find pleurocystidia
By: patty (patty)
2011-06-06 20:29:19 CEST (+0200)

it might be my inexperience, my rusty blade, my moldy microscope…. but I think I am cystidiaphobic. I am attempting to find them though.

By: patty (patty)
2011-06-06 19:19:44 CEST (+0200)

In the Guzman et al paper, it says in Table 1
“P. caerulescens (Pegler 1983) (= P. caribaea)”
I can’t find anything else listing them as synonyms though… are they?

Created: 2011-06-06 18:05:08 CEST (+0200)
Last modified: 2013-04-12 00:00:56 CEST (+0200)
Viewed: 370 times, last viewed: 2018-09-21 01:47:04 CEST (+0200)
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