Halimium is a genus of Cistaceae, containing a small group of shrub species found in open vegetation types and in degraded forest patches throughout the western and central Mediterranean region. We recently described the morpho-anatomical features of the ectomycorrhizae formed by Scleroderma meridionale on Halimium halimifolium, but the mycorrhizal biology of this host plant genus is still largely unexplored. Here, we report new data on the ectomycorrhizal fungal symbionts of Halimium, based on the collection of sporocarps and ectomycorrhizal root tips in pure stands occurring in Sardinia, Italy. To obtain a broader view of Halimium mycorrhizal and ecological potential, we compiled a comprehensive and up-to-date checklist of fungal species reported to establish ectomycorrhizae on Halimium spp. on the basis of field observations, molecular approaches, and mycorrhiza synthesis. Our list comprises 154 records, corresponding to 102 fungal species and 35 genera, revealing a significant diversity of the Halimium ectomycorrhizal mycobiota. Key ectomycorrhizal genera like Russula, Lactarius/Lactifluus, Amanita, Inocybe, and Cortinarius account for more than half of all mycobionts. A large proportion of Halimium fungal species are shared with other host plants in various ecological settings, suggesting a critical role of common mycorrhizal networks in the function played by this shrub in various Mediterranean ecosystems.

In this work, we characterize naturally occurring mycorrhizae formed by Amanita viscidolutea on Guapira opposita in the Atlantic Forest in Brazil. We sequenced the rDNA ITS region from the mycorrhizae and basidiomata to identify both symbionts. Amanita viscidolutea mycorrhizae were up to 43 mm long, mostly simple, and unbranched to irregularly pinnate. The fungal mantle surface was velvety to slightly cottony and white to yellowish with silver patches. Hyphal strands were infrequently present. Although the fungal mantle consisted of clampless hyphae, emanating hyphae and hyphal strands had sparsely distributed clamp connections. A unique character of the mycorrhizae was the absence of a Hartig net.

Fourteen species in three genera of Clavariaceae from the Atlantic Forest of Brazil are described (six Clavaria, seven Clavulinopsis and one Ramariopsis). Clavaria diverticulata, Clavulinopsis dimorphica and Clavulinopsis imperata are new species, and Clavaria gibbsiae, Clavaria fumosa and Clavulinopsis helvola are reported for the first time for the country. Illustrations of the basidiomata and the microstructures are provided for all taxa, as well as SEM images of ornamented basidiospores which occur in Clavulinopsis helvola and Ramariopsis kunzei. A key to the Clavariaceae of Brazil is also included.

Seven species of Scytinopogon in the Atlantic Forest of Brazil are described. Scytinopogon caulocystidiatus and S. foetidus are proposed as new species based on morphological and molecular data. Five other species are presented: S. chartaceus, S. dealbatus and S. robustus, originally described from Brazil; and S. pallescens and S. scaber, previously reported for Brazil. Illustrations of the basidiomata and microstructures, including SEM images of ornamented basidiospores, are provided for all taxa. Comparisons with morphologically similar taxa and a key to the seven species of Scytinopogon known to occur in Brazil are also presented.

Novos registros de fungos agaricoides (Basidiomycota) na Paraíba, Brasil. O artigo apresenta uma lista de dezoito espécies de fungos agaricoides coletadas na Mata Atlântica paraibana. Hygrocybe subcaespitosa e Marasmius similis são novos registros para o Brasil. Dezesseis espécies são novos registros para a Paraíba.