Skip to page content
USDA Forest Service

Research & Development Treesearch

Treesearch Home
About Treesearch
Contact Us
Research & Development
Forest Products Lab
International Institute of Tropical Forestry
Pacific Northwest
Pacific Southwest
Rocky Mountain
Southern Research Station
Help - We Participate  Government Made Easy

Global Forest Information Service

US Forest Service
P.O. Box 96090
Washington, D.C.

(202) 205-8333

You are here: Home / Search / Publication Information
Bookmark and Share

Publication Information

View PDF (31.5 MB)

Title: A contribution toward a monograph of North American species of Suillus

Author: Smith, Alexander H.; Theirs, Harry D.;

Date: 1964

Source: Privately published. Ann Arbor, MI. 116 p.

Publication Series: Miscellaneous

Description: One of the most troublesome groups of the Boletaceae, as far as the recognition of taxa is concerned, has been the group generally known as the section Viscipelles of Boletus in the older literature. This group represented a "gray area" between Boletinus on the one hand and Boletus sensu lato on the other. However, attempts to distinguish species in Suillus were frustrating not so much because of the difficulty of recognizing them in nature by the ordinary characters used to distinguish species and varieties in the fleshy fungi generally, but because of the difficulty of interpreting the conflicting statements in the literature or one's inability to find specimens whose characters compared well with those given in the published descriptions. There is no denying that the species of Suillus are one of the most confused groups of fleshy fungi in North America. We offer here our observations and interpretations in the hope that future students will find them useful and to the point on taxonomic problems. Our treatment does not introduce much in the way of new characters, but we hope we have made a contribution toward a better evaluation of the features emphasized by previous authors, as well as having standardized others, such as the color of the spore deposit, so that their interpretation by future workers will be more accurately and readily made.

Keywords: Suillus, Boletaceae

Publication Notes:

  • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
  • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
  • You may send email to to request a hard copy of this publication. (Please specify exactly which publication you are requesting and your mailing address.)



Smith, Alexander H.; Theirs, Harry D. 1964. A contribution toward a monograph of North American species of Suillus. Privately published. Ann Arbor, MI. 116 p.


 [ Get Acrobat ]  Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility

USDA logo which links to the department's national site. Forest Service logo which links to the agency's national site.