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Abstract
Suillus quiescens sp. nov. is common under Pinus muricata on Santa Cruz and Santa Rosa Islands in the northern Channel Islands of California, and we subsequently found it fruiting at Point Reyes National Seashore on the central coast of California. Sequences from the internal transcribed spacer region show that it is distinct from all 44 species of Suillus tested, and features of its morphology separate it from all other unsequenced species. Suillus quiescens has a broader distribution than coastal California because it also was encountered as ectomycorrhizae on roots of pine seedlings from the eastern Sierra Nevada, coastal Oregon and the southern Cascade Mountains. The reason it had not been identified from these areas might be due to its resemblance to S. brevipes at maturity or it might be a rare fruiter that persists in the spore bank.
We thank the Harry Thiers Herbarium (SFSU) for loans of S. occidentalis and S. volcanalis specimens, Peter Kennedy for determining the ITS sequences of S. quiescens, TDB3205, the University of California Santa Cruz Island Natural Reserve and Channel Islands National Park for permission to collect fungal specimens, Lyndal Laughrin and Sarah Chaney for arranging logistical support on Santa Cruz Island and Santa Rosa Island respectively, and Roy Halling, Manfred Binder and an anonomous reviewer for many useful suggestions on the manuscript Financial support was supplied in part by NSF DEB-0618293 to TDB and ECV. We dedicate this work to Harry Thiers, whose command of the western North American Suillus species remains unsurpassed.