Harry D. Thiers

The secotioid syndrome

Conference sur les affinites entre les Champignons Secotioides et les Agaricaceae et leurs voies evolutives

Studies in the Genus Gastroboletus

The following species ofGastroboletus are described as new:G. subalpinus, G. xerocomoides, G. suilloides, G. imbellus, andG. amyloideus. All of these species have been found in the western portion of the United States. Comments on two previously known species from this region are included. Brief statements are also presented on the possible origin and evolution of this taxon of fungi

Amatoxin-containing mushrooms: Amanita ocreata and A. phalloides in California.

Each year in western North America the greatest number of serious or fatal cases of mushroom poisoning occur in California (5). In the past most of these poisonings have been attributed to Amanita phalloides (Vaill. ex Fr.) Secr., a common species in California. The well known, deadly white Amanitas, such as A. bisporigera Atk., A. verna (Bull. ex Fr.) Pers. ex Vitt. and A. virosa Secr., are not common in western North America and, furthermore, have not been shown to occur in California (2, 9, 17, 19). Over the years fatal cases of mushroom poisoning have been reported in California during the late winter and spring months (1, 3), often after A. phalloides has finished fruiting for the season. A study of the California Amanita flora (2) revealed that only a few species fruit in the spring, two of the most common being A. calyptroderma Atk. &

Notes on Boletes—I 1. the Generic Position of Boletus Subglabripes and Boletus Chromapes 2. a Comparison of Four Species of Tylopilus

A study of Boletus subglabripes and Boletits chromapes in relation to the diagnostic characters of the genus Leccinum failed to substantiate the transfer of either species to Leccinunmi. Boletus chromapes is transferred to Tylopilus and B. subglabripes is retained in Boletus. A study of four species in what is now recognized as the stirps Pseudoscaber was also made. No evidence was found to maintain the genus Porphyrellus as compared to Tylopilus so all four species are placed in the latter genus. Tylopilus cyaneotinctus is described as new. T. pseudoscaber, T. umnbrosellus, and T. sordidus are included in Tylopilus as new combinations.

A New Species of Suillus

Romano, A. H. 1966. Dimorphism, pp. 181-209. In G. C. Ainsworth and A. S. Sussman [eds.], The Fungi, Vol. II, Academic Press, New York. Salvin, S. B. 1947. Cultural studies on the yeastlike phase of Histoplasma capsulatum Darling. J. Bacteriol. 54: 655-660. Wolf, F. T. 1955. Nutrition and metabolism of the tobacco wilt Fusarium. Bull. Torrey Bot. Club 82: 343-354. Zapater, R. C., A. de Arrechea, and V. H. Guevara. 1972. Queratomicosis por Fusarium dimerum. Sabouraudia 10: 274-275.

California Boletes V. Two New Species of Boletus

Two new species of red-pored boletes, Boletus pulcherrimus and Boletus haematinus are described from California. In addition, Boletus castwoodiae is reduced to synonymy with Boletus satanas.