C. Illana

Protophysarum phloiogenum and a new family in the Physarales

A taxonomic and chorologic study of Protophysarum phloiogenum, including light and SEM micrographs is presented. The authors propose the new family Protophysaraceae in the Physarales.

A rare Didymium from Spain

Didymium subreticulosporum, a rare species from Valencia, is described and illustrated by SEM and LM photographs, and compared to related species.

A critical study of some Stemonitales

Based upon studies of type specimens six species of Stemonitales are redescribed and illustrated: Comatricha microcarpa, C. laxa, C. nigricapillitium, Stemonitis fusca and S. nigrescens are critically reviewed and illustrated. Comatricha microcarpa is considered to be a nomen ambiguum , and Stemonitis nigrescens is treated as an extreme form of S. fusca. S. virginiensis is recognized as a rare species distinct from the smaller forms of S. fusca. Comatricha nigricapillitium comb. nov. is proposed for Lamproderma nigricapillitium .

Nivicolous Myxomycetes from Tyrol (Austria). I.

Abstract 25 taxa of Myxomycetes collected around melting snow banks in montaneous and alpine areas of Tyrol are presented. From a chorological point of view especially interesting are: Diderma asteroides, D. lyallii, D. peyerimhoffii, Didymium nivicolum, Hemitrichia abietina, Physarum alpestre, Trichia persimilis, Trichia sordida var. sordida, Trichia sordida var. sordidoides . The nivicolous taxa Badhamia alpina and Didymium wilczekii are considered to be synonyms of Badhamia foliicola and Didymium dubium . SEM micrographs of spores and capillitia of the most significant species are included.

Diacheopsis metallica and Diacheopsis kowalskii: comparison of two distinct myxomycete species

The only microscopic slide of Diacheopsis metallica studied by Charles Meylan conserved in Lausanne was examined, and a neotype was proposed for this species. Diacheopsis metallica is compared with other European and American collections and with Diacheopsis kowalskii. Both species are considered distinct due to differences in spore size and morphology of the capillitium. Light microscope and scanning electron microscope photographs of D. metallica and D. kowalskii are presented; the species are new records for Spain.

A taxonomic review of the nivicolous species of myxomycetes described by Kowalski. I. Order Stemonitales

Five type specimens of species from the order Stemonitales proposed by Kowalski are re-examined. These are Comatricha fusiforme, Diacheopsis effusa, D. serpula, Lamproderma acanthosporum and L. disseminatum. SEM and LM micrographs of spores, capillitia and sporocarps are provided. Critical study of these type specimens supports Kowalski’s recognition of these taxa as good and valid species.