ITALIC 8.0

Micarea hedlundii Coppins

Bull. Brit. Mus. Nat. Hist., Bot. ser., 11: 135, 1983.

Synonyms:

Distribution: N - Ven (Nascimbene & al. 2013b), TAA (Thor & Nascimbene 2007, Nascimbene & al. 2022).

Description: Thallus crustose, episubstratic, effuse, olive-green, minutely granular, composed of 20-40 µm wide goniocysts containing orange granules reacting K+ and C+ violet. Apothecia very rare, micareoid, 0.2-0.5 mm across, often tuberculate, pale brown to grey-brown, with a strongly convex disc, without a proper margin. Proper exciple indistinct; epithecium yellowish brown, K+ violet; hymenium colourless, often with irregular, brownish vertical streaks reacting K+ violet; hypothecium colourless to yellowish. Asci 8-spored, clavate to cylindrical-clavate, with an unstained wall and a K/I+ blue outer layer and apical dome, the latter with a non-amyloid, cylindrical axial mass. Ascospores 0(-1)-septate, hyaline, ellipsoid, ovoid or oblong, 6.5-12 x 2.5-4 μm. Pycnidia stalked, cylindrical, usually unbranched, 0.2-0.5(-1) mm tall, the stalk pink-brown or grey-brown, but covered in a whitish tomentum, the wall K+ and C+ violet. Mesoconidia narrowly ellipsoid, 4-6 x 1.2-1.7 μm. Photobiont micareoid, thin-walled, the cells 4-7 μm wide. Spot tests: thallus K- or K-+ faintly violet, C- or C+ faintly violet, P- (reactions best visible under the microscope).

Note: a rather rare species growing on wood (mostly on the vertical surfaces of stumps) and rotting roots of conifers in montane to subalpine forests, ranging from the Alps to Northern Europe. It is included in the Italian red list of epiphytic lichens as “Critically Endangered” (Nascimbene & al. 2013c).

Growth form: Crustose

Substrata: lignum

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly sexual, or asexual by conidia and thalloconidia

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:

1

2

3

4

5

(info)

Solar irradiation:

1

2

3

4

5

(info)

Aridity:

1

2

3

4

5

(info)

Eutrophication:

1

2

3

4

5

(info)

Poleotolerance:

0

1

2

3

(info)

Altitudinal distribution:

1

2

3

4

5

6

(info)

Predictive model

Herbarium samples

Index Fungorum GBIF

Andres Saag - CC BY-SA NC - Source: http://esamba.bo.bg.ut.ee/checklist/est-img/browserecord.php?-action=browse&-recid=2155