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Abstract
Lactarius rubriviridis sp. nov., characterized by hypogeous, sequestrate basidiomes with red latex, green stains, and forcibly discharged, reticulate basidiospores is described and illustrated. During the Spring, the new species forms basidiomes associated with conifers at 1400–1800 m elevation in the Sierra Nevada, and is known from two specimens collected 19 yr apart. Comparisons with the putatively polyphyletic genera Arcangeliella and Zelleromyces, and an accounting of all known members of these genera are provided.
The first author dedicates this paper to Dr. Harry D. Thiers (deceased, 8 Aug 2000) and Mr. Herbert M. Saylor (deceased, 19 May 2000), whose contributions to the field of mycology are unparalleled. Both of these outstanding mycologists were my first mentors and they greatly influenced my career in mycology. I thank Dr. Roy Halling (NYBG) and Dr. Scott Redhead (DAOM) for their advice and critical comments, and Mrs. Ellen Thiers for preparing the Latin diagnosis. A special thanks to Michael Wood (www.mykoweb.com) for use of his color photographs of the new species.