Lepra trachythallina (Erichsen) Lendemer & R.C. Harris

Bryologist 120: 187, 2017.
Synonyms: Pertusaria laevigata (Nyl.) Arnold non (Th. Fr.) Anzi; Pertusaria trachythallina Erichsen; Variolaria trachythallina
Distribution: N - TAA (Nascimbene & al. 2022).
Description: Thallus crustose endosubstratic to thinly episubstratic, whitish to grey, continuous, smooth or uneven, the margins not zoned. Apothecia lecanorine, immersed in soralia-like, 0.5-1(-2) mm wide thalline warts which are constricted at base and sometimes subglobose, 1-3 per wart, with a to 2 mm wide, pink, reddish or rarely finally black, granular, bluish-pruinose disc surrounded by a usually persistent thalline rim. Asci (1-)2-spored, the apex without a distinct ocular chamber, the outer sheath K/I+ blue, otherwise K/I–, with an inner extensible layer, Pertusaria-type. Ascospores often not well-developed, 1-celled, hyaline, ellipsoid, (38-)50-160 x (18-)25-60 µm, the wall 5-7 µm thick. Photobiont chlorococcoid. Spot tests: K+ yellow, C-, KC-, P+ yellow-orange. Chemistry: thamnolic acid; lichexanthone reported from some North American specimens.
Note: a cool-temperate, perhaps circumpolar lichen found on smooth bark of deciduous trees, especially Fagus, in humid montane forests. It is included as “Regionally Extinct” in the Italian red list of epiphytic lichens (Nascimbene & al. 2013c).
Growth form: Crustose
Substrata: bark
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
Poorly known taxon in need of further study

Commonnes-rarity: (info)

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

pH of the substrata:

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Eutrophication:

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Poleotolerance:

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Altitudinal distribution:

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Predictive model
Herbarium samples
Index Fungorum GBIF


Curtis Randall Björk CC BY-SA 4.0
New York, Lake Placid area, Heart Lake Photographed from specimen (Goward 82-38, UBC), on trunk Betula in open, Abies balsamea-Picea forest on ridge
1982-03-08



Curtis Randall Björk – CC BY-SA 4.0
New York, Lake Placid area, Heart Lake Date: 1982-03-08 Photographed from specimen (Goward 82-38, UBC), on trunk Betula in open, Abies balsamea-Picea forest on ridge



Felix Schumm - CC BY-SA 4.0
[16735], USA, Wisconsin, Oneida County: Roadside, mixed hardwood- conifer forest in Patterson Hemlocks State Natural Area, 1.2 miles south of state route 70, T.39N, R.4E, sec. 3, 45°53'49-51'' N, 89°58'28'' W, ca. 1,500 ft. elevation, on trunk of roadside birch (Betula sp.). Leg. John G. Guccion 29 April 2002 (No. 736). - Spores 2/Ascus, uniseriate, 120 x 37 μm. Thallus K+ gelb, UV-.



Felix Schumm - CC BY-SA 4.0
[16735], USA, Wisconsin, Oneida County: Roadside, mixed hardwood- conifer forest in Patterson Hemlocks State Natural Area, 1.2 miles south of state route 70, T.39N, R.4E, sec. 3, 45°53'49-51'' N, 89°58'28'' W, ca. 1,500 ft. elevation, on trunk of roadside birch (Betula sp.). Leg. John G. Guccion 29 April 2002 (No. 736). - Spores 2/Ascus, uniseriate, 120 x 37 μm. Thallus K+ gelb, UV-.