Observation 308246: Lactarius kauffmanii var. kauffmanii

When: 2017-09-16

Collection location: Mohican State Park, Ohio, USA [Click for map]

40.6128°N 82.3168°W 204m

Who: Django Grootmyers (heelsplitter)

Specimen available

Notes:
Growing in needle litter at the edge of a parking lot. Potential ECM hosts noticed in the area were Quercus spp., Pinus strobus, Tsuga canadensis, Fagus grandifolia, Carpinus caroliniana and Betula alleghaniensis (probably not for this one). Caps viscid. Odor not distinctive. Taste acrid. Latex watery and slowly drying green. and staining tissues green. Spharocysts present in the gill trama. Pleurocystidia present. Spores strongly amyloid and reticulate. Spore projections measured between 0.9 and 1.8 µm high. May have overlooked shorter projections. Spore measurements from Piximetre: (8.1) 8.2 – 9.1 (9.8) × (5.8) 6.1 – 6.9 (7) µm, Q = (1.2) 1.3 – 1.4 (1.5); N = 20, Me = 8.6 × 6.5 µm; Qe = 1.3
Individual spores: 8.73 × 6.84 µm, 8.32 × 6.52 µm, 8.22 × 6.04 µm, 8.43 × 6.54 µm, 8.73 × 6.68 µm, 9.11 × 6.35 µm, 8.89 × 6.91 µm, 8.34 × 6.25 µm, 8.63 × 6.59 µm, 8.11 × 6.11 µm, 8.34 × 6.51 µm, 8.93 × 6.59 µm, 8.81 × 6.38 µm, 8.46 × 5.80 µm, 8.29 × 6.45 µm, 9.84 × 6.93 µm, 8.21 × 6.57 µm, 8.39 × 6.60 µm, 8.08 × 6.20 µm, 9.40 × 6.98 µm

Species Lists

Images

2017-10-06-04.37.23 ZS PMax edit.jpg
2017-10-06-04.35.19 ZS PMax edit.jpg
20170916_165201 crop.jpg
DSC_2207.JPG
Gill section at 100x in Melzer’s
DSC_2242.JPG
Spores at 1000x in Melzer’s
DSC_2250.JPG
Spores and sphaerocysts at 1000x in Melzer’s
DSC_2231.JPG
Spores at 1000x in Melzer’s
DSC_4948 edit.jpg

Proposed Names

30% (2)
Used references: Bessette, A., Harris, D. B., & Bessette, A. R. (2009). Milk mushrooms of North America. Syracuse University Press.
Based on microscopic features: Spore size and ornamentation
15% (2)
Used references: Bessette, A., Harris, D. B., & Bessette, A. R. (2009). Milk mushrooms of North America. Syracuse University Press.
-29% (1)
Used references: Bessette, A., Harris, D. B., & Bessette, A. R. (2009). Milk mushrooms of North America. Syracuse University Press.
-29% (1)
Used references: Bessette, A., Harris, D. B., & Bessette, A. R. (2009). Milk mushrooms of North America. Syracuse University Press.
-29% (1)
Recognized by sight: Bessette, A., Harris, D. B., & Bessette, A. R. (2009). Milk mushrooms of North America. Syracuse University Press.
17% (2)
Used references: BLAST results

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= Observer’s choice
= Current consensus

Comments

Add Comment
Not Lactarius pseudomucidus
By: Alan Rockefeller (Alan Rockefeller)
2019-02-11 11:51:22 -05 (-0500)

The sequence which this matches (https://www.ncbi.nlm.nih.gov/nucleotide/KF359599) is from the Smoky Mountains and is probably misnamed, while the west coast sequences (such as https://www.ncbi.nlm.nih.gov/nucleotide/KP889372) differ significantly. The west coast collections also have a much darker stem.

Spores
By: Django Grootmyers (heelsplitter)
2018-02-04 20:36:07 -05 (-0500)

The spore measurements are a bit off for L. kauffmanii var. kauffmanii, but out of all of the available options, it seemed to be the best fit.

Created: 2018-02-04 20:32:12 -05 (-0500)
Last modified: 2019-02-11 11:51:57 -05 (-0500)
Viewed: 51 times, last viewed: 2019-02-11 23:42:00 -05 (-0500)
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