Observation 108542: Lactarius sect. Uvidi (Konrad) Bon
When: 2012-08-29
No herbarium specimen
0 Sequences

On ground in mixed conifer (mostly PIPO)

Proposed Names

33% (2)
Used references
Based on microscopic features
Based on chemical features

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

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
By: Mike Hopping (AvlMike)
2014-07-19 13:23:45 PDT (-0700)

Very nice description and photos. I have trouble with your ID though. L. subpalustris is big, cap diameter 4-8 inches (Bessette, Harris, Bessette)or 5-20 cm (MushroomExpert). There’s no umbo in youth. It’s reportedly an Eastern species associated with hardwoods. The stipe is typically, in my limited experience, glaringly scrobiculate. Your macrochemical results are not inconsistent with Bessette, Harris, and Bessette but Kuo says KOH should turn the cap yellow. Maybe the chemical tests aren’t totally reliable for distinguishing purple-staining Lactarius species?

L. montanus (L. uvidus var. montanus) is a smaller Western species associated with conifers. The cap of the closely related L. uvidus var. uvidus, also reported from California and sometimes associated with pine can be umbonate in youth (B,H,B). The flesh stains purple in both species but then progresses to brown—as shown by your cut stipe? The stipes are not scrobiculate. KOH on the cap of either should produce a green reaction—possibly the sole point against this ID.

Your specimens may not be either of these two, but they seem a closer match than L. subpalustris.

Created: 2012-09-03 18:40:27 PDT (-0700)
Last modified: 2014-07-20 09:20:18 PDT (-0700)
Viewed: 60 times, last viewed: 2017-06-13 22:21:46 PDT (-0700)
Show Log