Pleurocybella ohiae

Pleurocybella ohiae is a species of agaric fungus in the family Marasmiaceae. Newly described to science in 2011, it is known only from Hawaiian montane wet forests.[1]

Pleurocybella ohiae
Scientific classification
Kingdom:
Fungi
Division:
Basidiomycota
Class:
Agaricomycetes
Order:
Agaricales
Family:
Marasmiaceae
Genus:
Pleurocybella
Species:
P. ohiae
Binomial name
Pleurocybella ohiae
Desjardin & Hemmes (2011)
known only from Hawaii

Taxonomy

The species was first described scientifically by Dennis Desjardin and Don Hemmes in 2011 in Mycologia. They considered the fruit body morphology similar to those produced by species in the genera Campanella and Cheimonophyllum, but used microscopic morphology for placement in Pleurocybella. The specific epithet ohiae refers to the Hawaiian name of the tree, ʻōhiʻa, upon which the fungus grows.[1]

Description

The fruit bodies of Pleurocybella ohiae are small, white, and lack a stem. The caps are 0.5–0.8 cm (0.2–0.3 in) in diameter, and have a smooth, dull surface with a silky or felt-like texture. Fruit bodies attach to the substrate by a cleft. The broad gills originate from the base of the cleft, and are distantly spaced, with two sets of interspersed lamellulae (shorter gills that do not extend completely to the cap margin). The color is white throughout, including cap, gills, and flesh.[1]

The thin-walled spores are roughly pear-shaped to drop-shaped, smooth, hyaline (translucent), and typically measure 6.5–8 by 4.2–5.4 μm. The basidia (spore-bearing cells) deflate after ejecting their attached spores, and no sterigmata were detected. Basidioles (immature or aborted basidia) are club-shaped, have clamps, and measure 17.5–25 by 5.5–7.5 μm. The fungus lacks cystidia, and instead has basidioles on the edge of the gill. Clamp connections are present in the hyphae of all tissues.[1]

Habitat and distribution

Endemic to Hawaii, Pleurocybella ohiae is known only from a single collection, where it was found growing solitarily on the bark of Metrosideros polymorpha in the Ohia montane wet forests.[1]

References
  1. Desjardin DE, Hemmes DE. (2011). "Agaricales of the Hawaiian Islands 9. Five new white-spored species from native montane wet forests". Mycologia. 103 (6): 1441–50. doi:10.3852/11-114. PMID 21700634.
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