ITALIC 8.0

Involucropyrenium pusillum Breuss & Türk

Beitr. Naturk. Oberösterreichs, 13: 214, 2004

Synonyms:

Distribution: C - Tosc (Fanfarillo & al. 2024).

Description: Thallus small-squamulose greenish brown, matt, the squamules adpressed to raised at margins, contiguous to slightly overlapping, weakly crenulate-lobulate, 0.2-0.5 mm wide, 100-150 µm thick, paraplectenchymatous throughout, the cells 5-8 µm wide. Upper cortex up to 20 µm thick, poorly developed, consisting of 1-3 layers of cells free of algae; medulla and lower cortex not differentiated; rhizohyphae colourless, 2.5-3 µm thick. Perithecia black (somehow paler around the ostiole), originating among the squamules, subglobose, 0.25-0.4 mm across. Exciple colourless to pale brown, c. 25 µm thick, of tangentially arranged, elongated cells; involucrellum black, completely surrounding the perithecium 25-35 µm thick (thicker in upper part); hamathecium of periphyses measuring 20-30 x 1-1.5 µm, interascal filaments absent; hymenial gel hemiamyloid. Asci 8-spored, clavate, with biseriately arranged spores, the wall I-. Ascospores 1-celled, hyaline, ellipsoid, (19-)20-24(-25) x (8-)9-11(-12) µm. Pycnidia unknown. Photobiont chlorococcoid. Spot tests: cortex and medulla K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.

Note: on bryophytes overgrowing boulders of limestone; known from the type locality in the Eastern Alps, and from Portugal; the identification of the sample from Tuscany is not completely certain (Fanfarillo & al. 2024).

Growth form: Crustose

Substrata: rocks, soil, terricolous mosses, and plant debris

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

Alpine belt: absent

Subalpine belt: absent

Oromediterranean belt: absent

Montane belt: absent

Submediterranean belt: absent

Padanian area: absent

Humid submediterranean belt: extremely rare

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

Index Fungorum GBIF

Source:Prieto M., Martinez I., Aragón G., Gueidan C., Lutzoni F. 2012. Molecular phylogeny of Heteroplacidium, Placidium, and related catapyrenioid genera (Verrucariaceae, lichen-forming Ascomycota). Am. J. Bot., 99, 1: 23-35.