Lecidella pulveracea (Schaer.) P. Syd.

Die Flecht. Deutschl.: 211, 1887. Basionym: Lecidea enteroleuca var. pulveracea Flörke ex Schaer. - Enumer. Critic. Lich. Europ.: 128, 1850.
Synonyms: Biatora pulveracea (Schaer.) Stein.; Lecidea dubia Turner & Borrer non Schaer.; Lecidea pulveracea (Schaer.) Th. Fr.
Distribution: N - Frl (TSB 15106), Ven (Nascimbene & Marini 2010), TAA (Nascimbene & al. 2006, 2007b).
Description: Thallus subleprose, consisting in a thin to rather thick, continuous or cracked crust of farinose, to 0.1 mm thick, pale yellowish white to yellowish grey blastidia. Apothecia very rare, lecideine, 0.5 mm across, first immersed in thallus, with a convex, black disc and a thin, finally excluded proper margin. Proper exciple dark blue-green throughout; epithecium dark blue-green, granular; hymenium colourless, 70-110 μm high, containing crystals; paraphyses easily made free in K, mostly simple, c. 1 μm thick at base, the apical cells slightly swollen; hypothecium golden brown. Asci 8-spored, clavate, with an intensely I+ blue tholus penetrated by a weakly amyloid, broadly cylindrical axial mass, and a poorly developed ocular chamber, Lecidella-type. Ascospores 1-celled, hyaline, ellipsoid to ovoid, 8-13(-17) x 4-7(-9) μm. Photobiont chlorococcoid. Spot tests: thallus (blastidia) K+ yellow, C+ orange, KC+ orange, P-. Chemistry: 2,7-dichlor-6-O-methylnorlichenxanthone.
Note: a mainly temperate lichen found on base-rich bark of deciduous trees (e.g. Fraxinus, or on nutrient-enriched lignum. For the chemistry see Knoph & Leuckert (1997). It is included in the Italian red list of epiphytic lichens as “Data Deficient” (Nascimbene & al. 2013c).
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: very rare
Submediterranean belt: extremely rare
Padanian area: absent
Humid submediterranean belt: absent
Humid mediterranean belt: absent
Dry mediterranean belt: absent

pH of the substrata:


Solar irradiation:








Altitudinal distribution:


Predictive model
Herbarium samples

P.L. Nimis CC BY-SA 4.0
TSB 15106

P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (15106)