Sarcoscypha dudleyi
Sarcoscypha dudleyi, commonly known as the crimson cup or the scarlet cup, is a species of fungus in the family Sarcoscyphaceae of the order Pezizales. It has been frequently confused with Sarcoscypha coccinea, but can be distinguished from this and other related species in Sarcoscypha by differences in microscopic characteristics, such as the presence and number of oil droplets in the spores. An imperfect form of the fungus, lacking a sexually reproductive stage in its Biological [life cycle|life cycle], is classified as the species Molliardiomyces dudleyi.
In addition to its main distribution in the central to eastern United States, the fungus has also been recorded once in Bulgaria.
Taxonomy
The species was first collected by the botanist William Russell Dudley in October 1888, in Tompkins County, New York. American mycologist Charles Horton Peck, who described it in the 1894 Annual Report of the New York State Botanist, named it Peziza Dudleyi after its discoverer. Peck noted a physical resemblance to P. aurantia and P. inaequalis, and said that it could be distinguished from those species by its yellow hymenium and larger spores. Several mycologists have considered the species to be synonymous with S. coccinea. However, as was later pointed out by Harrington, "the importance of fresh material for species diagnosis, especially for noting ascospore guttulation, cannot be overstated. Although I had examined material from western North America I was not prepared to recognize that group as a species distinct from the two, large eastern North American species until I saw fresh material." As is the case with many fungi, microscopic differences between similar species can only be accurately determined by examining fresh material. Harrington analyzed herbarium specimens and fresh material of North American specimens of "S. coccinea", and found that both S. dudleyi and S. austriaca were commonly misidentified. These results echoed a similar 1984 analysis of European specimens, performed by Hans-Otto Baral.The phylogenetic relationships in the genus Sarcoscypha were analyzed by Francis Harrington in the late 1990s. The cladistic analysis combined comparison of sequences from the internal transcribed spacer in the non-functional RNA with fifteen traditional morphological characters, such as spore features, fruit body shape, and degree of hair curliness. Based on this analysis, S. dudleyi is part of a clade of evolutionarily related taxa that includes the species S. occidentalis, S. emarginata, S. hosoyae, S. korfiana and S. mesocyatha. All of these species contain large oil droplets in their spores, in contrast to the other major clade of Sarcoscypha, characterized by having smaller, more numerous droplets.
Sarcoscypha dudleyi is commonly known as the "crimson cup" or the "scarlet cup", sharing the latter name with S. coccinea.
Description
The fruit body is broad and shallowly to deeply cup-shaped. The exterior surface of the fruit body is covered with whitish, matted "hairs", while the interior fertile surface of the cup is scarlet- to orange-red. The edge of the cup is curved inwards in young fruit bodies. The stem, if present at all, is short.The asci are 400–500 by 12–14 μm, cylindrical, and operculate. The ascospores are elliptical to cylindrical with rounded ends, uniseriate, hyaline, and measure 26–40 by 10–12 μm. They contain two large oil drops at either end; the oil drops are useful taxonomic characters that may be used to help distinguish S. dudleyi from some other Sarcoscypha species. The spores are covered with a sheath of mucilage, which typically causes the eight spores of the ascus to be ejected together. The paraphyses are slender, slightly enlarged above, and contain numerous red granules. The granules contain carotenoid pigments such as plectaniaxanthine or beta carotene, and give the fruit body its color.