Tylopilus violatinctus T.J. Baroni & Both

Figure 1. Tylopilus violatinctus (specimen PLP847_2018_187) fruiting on soil in a hardwood forest dominated by oak (A). Cream colored spores turning brown with age (B). The stipe is white in color only near the attachment point and the rest of the stipe is light brown with tinge of purple, slightly reticulate and equal to clavate to slightly bulbous at base (B).

Tylopilus violatinctus (specimen PLP847_2018_187), a mycorrhizal Bolete, was found fruiting in a cluster on soil under a hardwood forest dominated by oak (Figure 1-A). The cap (7-12 cm wide) was glabrous, convex to plane, with a straight, entire to cremate margin. The cap color was light purple that bruised a darker shade of purple when handled. Pores were cream to buff in color turning brown with age, did not bruise and were depressed at the intersection with stipe. Stipe attachment was central to slightly eccentric and white in color only near the attachment point (Figure 1-B). The rest of the stipe (8 -110 cm) was light brown with maybe a tinge of purple, very slightly reticulate and equal to clavate, maybe slightly bulbous at base. Chemical reactions: Cap KOH amber and FeSO4 negative (Figure 2-C); Flesh yellow in FeSO4 with a faint blue ring around yellow stain (Figure 2-B).

Figure 2. In T. violatinctus pores do not bruise (A), flesh is yellow in FeSO4 with a faint blue ring around yellow stain (B) and KOH reaction on the cap is amber (C). Also, useful for field diagnostics is a bruising, a darker shade of purple, on the cap when handled (C).

Other notes: Taste is very bitter. Tylopilus violatinctus is one of four violate colored Boletes that occur in North American; the other violaceous species are T. plumbeoviolaceus (Snell & Dick) Singer, T. rubroubrunnes Mazar & Smith, and T. williamsii Singer & J. Garcia. Officially classified based on type species from New York state in 1998 T. violatinctus most similar, morphologically, to T. plumbeoviolaceus. However, the two species can be readily distinguished by the dark-purple colored stipe present in T. plumbeoviolaceus in contrast to the light-brown colored stipe of T. violantintcus, and the dark-purple brusing that occurs when the cap of T. violantintcus is handled (Figure 2-C).

Taxonomy: Basidiomycota, Agaricomycetes, Boletales, Boletaceae, Tylopilus, violatinctus.

Reference:

Bessette, A.E., Roody, W.C. and Bessette, A.R. Boletes of Eastern North America. Syracuse University Press, Syracuse, New York.

Baroni, T. J., & Both, E. E. 1998. Tylopilus violatinctus, a new species of Tylopilus for North America, with comments on other violaceous colored Tylopilus taxa. Bulletin of the Buffalo Society of Natural Sciences, 36, 261-264.

 

 

 

11.19.18

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