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Octosporella imitatrix Döbbeler & P.G.Davison
Nova Hedwigia 113: 393 (2021)
MycoBank: MB 840427
Holotype: U.S.A., Alabama: Shelby County, along Cahaba River, leg. P.G. Davison 2019-Apr-27 (10291A, NY-holotype)
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Ascomata: perithecia-like, (sub)globose, ellipsoidal, orange, in the dry state red, 210-340 x 180-250 µm; margin uncoloured caused by dense thick-walled setae 85-115 x 17-20 µm
Paraphyses: filamentous, 2-4 µm wide, very slightly constricted at the septa
Asci: claviform, thin-walled, in water 75-110 x 15-19 µm, easily breaking off above the foot, (3-7-)8-spored
Ascospores: 1-celled, ellipsoidal, usually slightly asymmetric, hyalin, with 2(3)large, globose, light orange to yellow oil-bodies, cell wall at the ends with cap-like thickenings, (22-)24-33(-40) x (7-)8-10(-12) µm
Host: Frullania ericoides (Nees) Mont.
Infectious structures: infects the leaf cells, appressoria sessile rarele stipitate, seen from above elliptical, sometimes almost circular
Habitat: on the epiphytic or epilithic liverwort Frullania ericoides in forest
Distribution: U.S.A. (Alabama, Mississippi)
Note: very similar to O. brevibarbata but with slightly longer setae and asci, the ascospores are slightly shorter and usually 8 per ascus (mostly 4- or 6-spored asci in O. brevibarbata), spores contain 2(3) oil-bodies instead of (2)3 in O. brevibarbata
References:
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Döbbeler P. & Davison P.G. 2021. Non-hypocrealean ascomycetes on Frullania mainly from Southeastern North America. - Nova Hedwigia 113: 361–401. DOI
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