Myochroidea leprosula (Arnold) Printzen, T. Sprib. & Tønsberg

Lichenologist, 40: 198, 2008. Basionym: Biatora leprosula Arnold - Lich. Exs.: 545, 1874.
Synonyms: Lecidea leprosula (Arnold) Harm.
Distribution: N - Frl (Hinteregger 1994, in Austrian terr., near the border).
Description: Thallus crustose, episubstratic, grey to grey-brown, of densely crowded, 0.05-0.15 mm wide, strongly convex, often slightly crenate to subcoralloid areoles. Apothecia biatorine, round to slightly irregular in outline, sessile with a constricted base or more rarely appressed, 0.3-0.8 mm across, with a ochre, orange-brown or red-brown, flat to slightly convex, sometimes thinly whitish-pruinose (only visible when wet) disc, and a distinct, but not prominent, finally often excluded proper margin. Exciple brown and with minute colourless granules in outer part, colourless or pale yellow within, laterally 40-100 μm thick, of strongly gelatinized, branched and anastomosing, radiating hyphae; epithecium to 25 μm high, pale ochre to reddish brown, with colourless to pale ochre granules, K-, N+ bright orange-brown, sometimes streaking into the hymenium; hymenium colourless, 60-75 μm high; paraphyses relatively easily separated, sparingly branched and anastomosing, 0.7-1.5 μm thick, the apical cells to 2 μm wide; hypothecium 70-150 μm high, colourless to yellowish. Asci 8-spored, cylindrical-clavate, the I+ blue tholus with a wide, I+ dark blue tube structure that expands towards the top, without a pale axial body, Psora-type. Ascospores 1-celled, hyaline, broadly ellipsoid, 9.5-15.5 x 4-8 μm. Photobiont chlorococcoid. Spot tests: thallus K-, C-, KC-, P-. Chemistry: 2 fatty acids
Note: a circumboreal species growing on twigs of subalpine shrubs, certainly more widespread in the Alps.
Growth form: Crustose
Substrata: bark
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly asexual, by soredia, or soredia-like structures (e.g. blastidia)

Commonnes-rarity: (info)

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


pH of the substrata:

(info)

1

2

3

4

5

Solar irradiation:

(info)

1

2

3

4

5

Aridity:

(info)

1

2

3

4

5

Eutrophication:

(info)

1

2

3

4

5

Poleotolerance:

(info)

0

1

2

3

Altitudinal distribution:

(info)

1

2

3

4

5




Pier Luigi Nimis - CC BY-SA 4.0
Herbarium: TSB 20796


P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (20796)
2001/11/22
sun-form