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Octosporella brevibarbata Döbbeler & P.G.Davison
Nova Hedwigia 113: 386 (2021)
MycoBank: MB 840425
Holotype: U.S.A., Alabama: Winston County, Bankhead National Forest, along FR 235, leg. P.G. Davison 2019-Mar-10 (10245A, NY-holotype)
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Ascomata: perithecia-like, (sub)globose, ellipsoidal, less often ovoid, barrel-shaped or almost turbinate, apically rounded or flattened, orange, in the dry state red, 220-330 x 170-290 µm; margin uncoloured caused by dense thick-walled setae
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, predominantely 4- or 6-spored
Ascospores: 1-celled, ellipsoidal, usually slightly asymmetric, if one end stronger attenuated, spore outline subcuneiform, hyalin, with 3(4), rarely (1)2 large, globose, light orange to yellow oil-bodies, cell wall at the ends with cap-like thickenings, (25-)27-37(-42) x (7-)8-10(-11) µm
Host: Frullania appalachiana Lindenb., F. eboracensis Lehm., F. virginica Lehm.
Infectious structures: infects the leaf cells, appressoria sessile rarely stipitate, seen from above elliptical, sometimes almost circular, 14-19 x 10-15 µm, wall 2-4 µm thick
Habitat: on the epiphytic liverworts Frullania appalachiana, F. eboracensis and F. virginica
Distribution: U.S.A. (Alabama, Mississippi, New Hampshire, North Carolina)
Note: very similar to O. imitatrix but with slightly shorter setae and asci, the ascospores are slightly longer and usually 4- or 6-spored, never 8-spored (mostly 8-spored asci in O. imitatrix), spores contain (2)3 oil-bodies instead of 2(3) in O. imitatrix
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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