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Protothelenella petri
Nomenclature
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Family: ProtothelenellaceaeGenus: Protothelenella
SUMMARY
Thallus indistinct, composed of a few algal cells (probably Elliptochloris) surrounded by hyphae between and around the ascomata.
Anamorph: not known.
Teleomorph: ascomata perithecia, 100-200 µm diam., rather irregular in form but usually ± pyriform, superficial, sessile, mostly in small clusters on the midrib region of the upper (inner) surface of inrolled leaves; dark grey to black, greenish when wet. Peridium composed of dull green pigmented hyphae with narrow lumina, 20-30 μm thick laterally and 40-60 μm thick in the apical region. Interascal tissue composed of persistent branched and anastomosed pseudoparaphyses. Asci 110-130 (-160) x 18-23 µm, clavate to cylindric-clavate, fairly short-stalked, thick-walled and fissitunicate, the outer gelatinous wall layer blueing in iodine and with a very faintly blue-staining apical plug, (4-) 8-spored. Ascospores 17-25 (-27) x 8.5-11.5 µm, ellipsoidal to fusiform-ellipsoidal, hyaline, muriform with 3-5 transverse septa and 1-3 incomplete longitudinal septa, the outer wall noticeably thicker than the inner septa, smooth, without an epispore or gelatinous sheath.