Mycobilimbia sphaeroides (Dicks.) S. Ekman & Printzen

in Cannon & al., Revisions of British and Irish Lichens, 11: 76, 2021. Basionym: Lichen sphaeroides Dicks. - Fasc. Pl. Crypt. Brit., 1: 9, 1785
Synonyms: Bacidia sphaeroides (Dicks.) Zahlbr.; Biatora pilularis (Körb.) Hepp; Biatora sphaeroides (Dicks.) Hornem.; Biatorina pilularis Körb.; Biatorina sphaeroides A. Massal.; Bilimbia sphaeroides (Dicks.) Körb.; Catillaria sphaeroides (A. Massal.) Schuler non auct.; Mycobilimbia pilularis (Körb.) Hafellner & Türk
Distribution: N - VG, Frl, Ven, TAA (Nascimbene & al. 2007b, Nimis & al. 2015), Lomb, Piem (Isocrono & al. 2004), Lig. C - Tosc, Umb (Ravera 1998, Panfili 2000b, Ravera & al. 2006), Laz (Ravera 2001, Nimis & Tretiach 2004), Abr (Gheza & al. 2021). S - Camp, Pugl, Cal (Puntillo 1995, 1996
Description: Thallus crustose, green to grey-green, thinly episubstratic, finely granulose, the granules 25-70 µm in diam, resembling soredia but corticate. Apothecia frequent, biatorine, round, sessile, 0.4-0.8(-1.2) mm across, with a strongly convex, whitish, pale yellowish white or pale flesh-coloured disc (in old apothecia sometimes brown), the proper margin indistinct in mature apothecia, but conspicuous in young ones, smooth, paler than disc. Proper exciple well-developed, paraplectenchymatous, colourless or pale yellow, 50-135 μm wide laterally; epithecium poorly differentiated, colourless to pale orange brown; hymenium colourless, 55-75 µm high; paraphyses mostly simple, coherent, 3-4 µm thick; subhymenium colourless, 50-85 μm high; hypothecium colourless, 100-250 μm high. Asci 8-spored, clavate, with a K/I+ blue apical dome penetrated by a narrow, K/I– apical cushion surrounded by a narrow, deeply K/I+ blue zone, the wall K/I- but surrounded by a I+ red-brown, K/I+ blue outer layer, the ocular chamber relatively small, Biatora-type. Ascospores (0-)1(-3)-septate (most ascospores 1-septate), hyaline, broadly ellipsoid to fusiform, (9-)12-17(-22) x (3-)4-5(-7) µm. Photobiont chlorococcoid. Spot tests, thallus and apothecia K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: on mosses growing on the bark of old deciduous trees, especially near the base of trunks in old, humid forests. Several old records are dubious, and could refer to Bilimbia sabuletorum.
Growth form: Crustose
Substrata: bark
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: absent
Oromediterranean belt: absent
Montane belt: rare
Submediterranean belt: extremely rare
Padanian area: absent
Humid submediterranean belt: very rare
Humid mediterranean belt: absent
Dry mediterranean belt: absent

pH of the substrata:

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Solar irradiation:

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Aridity:

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Eutrophication:

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Poleotolerance:

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Altitudinal distribution:

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Predictive model
Herbarium samples

Leif Stridvall http://www.stridvall.se/la/galleries.php



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (30724)
2003/03/12



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (30724)
2003/03/12



Domenico Puntillo; Owner: Domenico Puntillo
Italy



Domenico Puntillo; Owner: Domenico Puntillo
Italy


Leif Stridvall - Source: http://www.stridvall.se/lichens/gallery/
Courtesy: Anita Stridvall


Leif Stridvall - Source: http://www.stridvall.se/lichens/gallery/
Courtesy: Anita Stridvall


Author: Leif Stridvall - Source: http://www.stridvall.se/la/galleries.php