Observation 22612: Lactarius Pers.

When: 2009-06-28

Collection location: Luzerne Co., Pennsylvania, USA [Click for map]

Who: Dave W (Dave W)

No specimen available

Gerardii? Subgerardii? I think it comes down to the gill seperation. I’m calling this “subdistant.” So my guess is L. subgerardii, which MO does not recognize as a valid species name.


Copyright © 2009 Dave in NE PA
Copyright © 2009 Dave in NE PA

Proposed Names

29% (4)
Recognized by sight: Gills not closely spaced. White watery latex.
Used references: Phillips
29% (1)
Recognized by sight: Except the gills show no cross veins.

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= Observer’s choice
= Current consensus


Add Comment
By: walt sturgeon (Mycowalt)
2014-03-07 19:06:12 PST (-0800)

Russulaceae now has four genera, Russula, Lactarius, Lactifluus and Multifurca.
It’s all about the genes… My understanding is Lactifluus and Lactarius evolved along separate paths. Lactifluus is most common in the tropics but temperate regions have their share as well.

Lactarius is apparently being split.
By: Dave W (Dave W)
2014-03-07 17:27:48 PST (-0800)


In Species Fungorum, some of the mushrooms commonly recognized as representing species of Lactarius are now listed under both Lactarius and Lactifluus.

I’m wondering if the cross-veined gills reported for gerardii var gerardii may be a function of stage of development? I see a lot of the gerardii/subgerardii types here in the hemlock, pine, spruce, birch, beech woods of the Poconos. When they are fairly young with closely spaced gills, telling them apart from lignyotus types can be challenging.

By: Martin Livezey (MLivezey)
2014-03-07 15:51:11 PST (-0800)

Why is the genus name Lactifluus?