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Exploration of the diversity in the diatom genus Homoeocladia across Micronesia revealed several clusters of undescribed species based on variations around several characters. Using ultrastructural data from scanning electron microscopy, we describe seventeen new species in three of these morphological groups. (1) A group with external thickenings includes eight new species with costae and/or bordered areolae on valve face and/or conopea and/or peri-raphe zone, and one with similar areolae but no ornamentation; this group includes the previously described H. jordanii. (2) Large, linear species, resembling H. asteropeae and H. tarangensis; we describe three new species close to the latter. (3) A sinuous-areolae group includes five new species with areola openings shaped like “~”, “s”, or “z” on the valve and/or girdle bands, or both, and leads to reconsideration of the diagnosis of Homoeocladia schefterae and the recognition that the globally widespread species in this complex is H. coacervata sp. nov. The three groups are based solely on morphology and no genetic relationships are implied within or between the groups, other than having the characteristics of the recently redefined genus Homoeocladia. However, the high diversity of species in Homoeocladia suggests the genus is a good candidate to test for species flocks in this region and in at least one other comparable location, incorporating DNA sampling through either culturing or metabarcoding.
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Hydnum atlanticum, a new species from Eastern North America
A new species of Hydnum subgenus Rufescentia is described based on collections made in Canada (New Brunswick, Newfoundland and Labrador) and the USA (New York). The new species is found in conifer dominated forests ( e.g. Abies , Picea ) and occurs in bryophyte-covered ( Sphagnum , Bazzania ) soil. It differs from the ecologically similar H. quebecense in the duller brown colors of the basidiomes, the smaller basidiospores and the basidia predominantly with three or four sterigmata. Phylogenetic analysis of the ITS region place H. subconnatum and H. oregonense as the closest relatives of H. atlanticum , but these taxa differ in the larger basidiospores, number of sterigmata per basidium, caespitose growth and/or geographic distribution.
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- Award ID(s):
- 2030779
- PAR ID:
- 10418332
- Date Published:
- Journal Name:
- Fungal Systematics and Evolution
- Volume:
- 11
- ISSN:
- 2589-3823
- Page Range / eLocation ID:
- 63-70
- Format(s):
- Medium: X
- Sponsoring Org:
- National Science Foundation
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- Free Publicly Accessible Full Text
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Accepted Manuscript1.0
- Journal Article:
- https://doi.org/10.3114/fuse.2023.11.05
