Name: Lactifluus gerardii
Author: (Peck) Kuntze
Citation: Revis. gen. pl. (Leipzig) 2: 856 (1891)
Deprecated Synonyms: Lactarius gerardii Peck
Ecology: Mycorrhizal with hardwoods (especially oaks); also sometimes reported under conifers; growing alone, scattered, or gregariously; summer and fall; widely distributed east of the Great Plains, and extending at least as far south as Costa Rica.
Cap: 3-10.5 cm; convex with a small point in the middle, becoming flat with an uplifted margin, with the central point often disappearing; dry; usually described as finely velvety (but see comments above); often with a rugged and wrinkled surface; yellow-brown to grayish brown; the margin sometimes becoming scalloped.
Gills: Running down the stem; quite distant; stark white.
Stem: 3-8 cm long; 1-2.5 cm thick; more or less equal; dry; without potholes; textured and colored like the cap; sometimes with a white apex, or sometimes with the gills running into the brown coloration; becoming hollow.
Flesh: White; thin; somewhat brittle.
Milk: White; unchanging on exposure to air; not staining tissues.
Odor and Taste: Odor not distinctive; taste mild or slightly acrid.
Chemical Reactions: KOH on cap surface negative; on flesh yellowish.
Spore Print: White.
Microscopic Features: Spores 7-10 × 7.5-9 µ; globose to subglobose; ornamentation 0.5-0.8 µ high, as amyloid warts and ridges forming partial or complete reticula. Pleuromacrocystidia absent, or present as scattered clavate elements slightly projecting. Cheilocystidia inconspicuous; cylindric. Pileipellis a trichoepithelium; terminal cells long and cystidium-like; brown in KOH.
REFERENCES: Peck, 1873, (Saccardo, 1887; Coker, 1918; Hesler & Smith, 1979; Smith, Smith & Weber, 1979; Phillips, 1991/2005; Lincoff, 1992; Roody, 2003; McNeil, 2006; Binion et al., 2008.) Herb. Kuo 08050305, 07230406, 07160705, 06280805.
Kuo, M. (2011, March). Lactarius gerardii. Retrieved from the MushroomExpert.Com Web site: http://www.mushroomexpert.com/lactarius_gerardii.html
“A world-wide phylogeny of this group showed that part of the subgenus and particularly the species affiliated to L. gerardii, do not fall in the Plinthogalus clade but for a separate, well-supported group, described as
Lactarius subg. Gerardii (A.H. Sm. & Hesler)(Stubbe et al., 2007b, 2010). Since it has been shown that Lactarius is not a monophyletic group, two genera of
milkcaps are now considered: Lactarius and Lactifluus(Buyck et al., 2008, 2010)and the former group of so-called well characterized Plinthogali falls apart in the two genera. Lactifluus subg. Gerardii shares the macromorphological aspect and the highly and reticulately ornamented spores, the lack of true pleurocystidia and palisade-like pellis structures with Lactarius subg. Plinthogalus. However, Lactifluus subg. Gerardii is distinguished from Lactarius
subg. Plinthogalus by the white spore print and the well-developed cellular layer of globose cells in the palisadic pileipellis.”
“This paper treats Lactarius subg. Gerardii (proposed here as new combination in Lactifluus). In this subgenus 17 combinations at species level are proposed.”
(2012) MYCOTAXON. 119. p.483-485
Created: 2010-06-25 19:35:16 -05 (-0500) by Erlon (Herbert Baker)
Last modified: 2014-03-14 13:23:31 -05 (-0500) by Erlon (Herbert Baker)
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