Observation 49317: Lactarius psammicola A.H. Sm.

When: 2010-07-28

Collection location: Goose Island County Park, La Crosse Co., Wisconsin, USA [Click for map]

Who: Tom Volk (TomVolk)

Specimen available

Under oak, on the fllod plain of the Mississippi River in Wisconsin.

Does not seem to fit exactly. the color of the gills does not match pictures. Could it be Lactarius zonarius? or something else? The stem is also very scobilculate.

[admin – Sat Aug 14 02:00:46 +0000 2010]: Changed location name from ‘Goose Island County Park, La Crosse County, La Crosse, Wisconsin’ to ‘Goose Island County Park, La Crosse Co., Wisconsin, USA


no flash picture. fluorescent lights
flash picture
spores in Melzer’s reagent.
top of cap

Proposed Names

77% (2)
Eye3 Eyes3
Recognized by sight: zonate cap, gills very pale orange ochre, latex white, unchanging, stem scrobiculate. growing under oak on the flood plain of the Mississippi river.
Used references: How to know the gilled mushrooms, Roger Phillips, and mushroom expert
Based on microscopic features: spores 9 X 7 um, amyloid, partially reticulate ornamentation

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

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
added cap pic
By: Tom Volk (TomVolk)
2010-07-28 20:23:35 CDT (-0500)

Thanks Debbiw. I forgot the cap pic. :)

not a bad match for L. psammicola f. psammicola…
By: Debbie Viess (amanitarita)
2010-07-28 18:25:40 CDT (-0500)

as described in the new “Milk Mushrooms of North America” book:
spore size and partial reticulation fits.
gill color fits (“lite buff at first, becoming darker and sordid ochraceous w/age, sometimes staining pinkish-lilac”)
scrobiculate stipe fits.
white latex that only sometimes changes color.
taste acrid (in f. glaber “taste very strongly burning acrid”…get student to taste! ;)
occurs with oak.

whether cap is glabrous (f. glaber) or matted fibrillose (f. psammicola) will get you to the subspecies, but only psammicola shows partial reticulation.

Lactarius zonarius does not have a scrobiculate stipe, according to the Bessettes.

By: Debbie Viess (amanitarita)
2010-07-28 18:10:47 CDT (-0500)

cap photo?

Created: 2010-07-28 17:31:17 CDT (-0500)
Last modified: 2011-10-10 19:44:42 CDT (-0500)
Viewed: 259 times, last viewed: 2018-09-21 18:28:12 CDT (-0500)
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