Caleb A. Morse

Three new species of Rinodina (Physciaceae) and a new record from North America

Abstract Rinodina campestris, R. megistospora and R. terricola are described as new to science. Rinodina boleana is recorded for the first time from North America and is compared in detail to R. pyrina and R. imshaugii and all are shown to possess Dirinaria–type spores.

Two new species of Candelariella and a key to the Candelariales (lichenized Ascomycetes) in North America

Abstract Two new species of Candelariella are described. Candelariella granuliformis is a polyspored, terricolous, small granular, blastidiate species known from arctic and alpine areas of North America and Scandinavia. Candelariella corviniscalensis, described from one locality in Colorado, is characterized by biatorine apothecia, long spores and an endolithic thallus. In addition a key to the presently recognized species in Candelariales known to occur in North America is provided.

A new North American species of Hyperphyscia (Physciaceae)

Abstract In North America, the widespread sorediate lichen known as Hyperphyscia adglutinata is shown to be heterogeneous. It contains two distinct species, one with primarily laminal soralia and another with marginal soralia. The latter taxon is here described as the new species H. confusa. Hyperphyscia adglutinata and H. confusa have broadly overlapping distributions in North America, especially in the Midwest and Great Plains states. Where they are sympatric, H. confusa is generally the more common of the two. Descriptions and discussions for H. adglutinata and the two other sorediate North American species, H. minor and H. pyrithrocardia, are also included, along with a key for separation of the four species. Hyperphyscia pyrithrocardia is reported for the first time from North America.

Acarospora nicolai (Acarosporaceae), a rediscovered species

Abstract Acarospora nicolai is revised and a lectotype designated. Acarospora caesiofusca is made a synonym of A. nicolai and a lectotype is designated. Acarospora nicolai is a pruinose brown crustose species containing gyrophoric acid and occurs in Mexico (Puebla) and the United States (Kansas, Oklahoma, Texas) on sandstone.

A new lichenicolous species of Toninia (Ramalinaceae) on Dermatocarpon in central North America

Abstract Toninia tecta, a non-lichenized obligately lichenicolous fungus, is described new to science. The species is known from several sites in midcontinental North America. Toninia tecta has an endokapylic thallus with dark superficial apothecia restricted to the sheltered undersides of thalli of saxicolous umbilicate species of Dermatocarpon. The new species is characterized by 3-septate ellipsoid ascospores, elongate filiform conidiospores, a reddish brown hypothecium and grey to greenish epithecium that reacts KOH–, HNO3+ violet. Features of the species are compared with those of other lichenicolous taxa in the genus.