Roselliniella cladoniae  

Anamorph: a hyphomycetous fungus with conidiophores similar to Stachybotrys but with hyaline curved conidia was reported by Zhurbenko & Pino-Bodas (2017).
Teleomorph: ascomata perithecia 250‒500 μm diam., globose to broadly pyriform, ± superficial. Ascomatal wall composed of thin-walled brown angular cells mostly 6-8 µm diam., covered by long medium brown remotely septate hyphae to ca 200 µm in length and 5 µm diam., sometimes upwardly curved, those on the lower part of the ascoma often descending to the host thallus surface. Interascal tissue composed of very thin-walled unbranched tapering paraphyses to ca 6 µm diam. near the base, the apices obtuse to rounded. Periphyses lining the ostiole. Asci 60-160 x 8-23 µm, cylindrical to clavate (the shape influenced by spore position), thin-walled, not fissitunicate, the apex tapered and bluntly rounded, without apical structures, not blueing in iodine, (1-) 2- to 8-spored. Ascospores irregularly arranged, (11.8‒) 18.2‒29.0 (‒38.0) × (7.3‒) 9.8‒13.2 (‒16.5) μm, mainly ellipsoidal, occasionally cylindrical, ovoid, citriform or subglobose, apices rather acute to occasionally rounded, sometimes attenuated or with a small beak/apiculus, aseptate or occasionally with 1 (non-median) to exceptionally up to 4 thin septa, not constricted at the septa, initially hyaline, becoming medium brown, wall smooth and thin, sometimes cracking and disintegrating into large pieces in squash mounts, occasionally with a gelatinous sheath when immature.

Description adapted partially from Matzer & Hafellner (1990) and Zhurbenko & Pino-Boad (2017). Map © British Lichen Society