ITALIC 8.0

Porpidia melinodes (Körb.) Gowan & Ahti

Ann. Bot. Fenn., 30: 67, 1993. Basionym: Aspicilia melinodes Körb. - Sber. Akad. Wiss. Wien, Math.-naturw. Kl., Abt. 1, 71: 3, 1872.

Synonyms: Haplocarpon melinodes (Körb.) V. Wirth; Huilia melinodes (Körb.) Hertel; Lecidea melinodes (Körb.) H. Magn.

Distribution: N - TAA (UPS-L-166873).

Description: Thallus crustose, episubstratic, orange to orange-grey, sometimes with olivaceous patches, smooth to cracked-areolate, sorediate, delimited by a byssoid, dull grey to black prothallus. Areoles angular, divided by deep cracks, smooth. Soralia scattered or in groups of 2-4, whitish but often with dark grey specks, 0.2-0.6(-1) mm across, crater-like and often delimited by a whitish, raised thalline rim; soredia coarsely granular. Medulla white, I-. Apothecia lecideine, black, at first semi-immersed, then sessile with a broad base, 0.3-1.5(-3) mm across, with a mostly flat, finally convex, thinly to heavily pruinose, sometimes subgyrose disc, and a thick, raised, smooth to crenulate, often finally flexuous and epruinose proper margin. Proper exciple of conglutinated, branched, 2-4 μm thick hyphae radiating from hypothecium, dark in outer part, paler within; epithecium olive-brown, granulose; hymenium colourless, 75-120(-150) μm high; paraphyses coherent, branched and anastomosing, slightly swollen at tips; hypothecium colourless or pale yellow-brown in upper part, dark brown in lower part. Asci 8-spored, elongate-clavate, with a thin, outer amyloid layer and a thickened tholus penetrated by a pore, the sides of which stain I/KI+ deep blue, Porpidia-type. Ascospores 1-celled, hyaline, ellipsoid, halonate, (14-)18-23(-26) x (6.5-)8-11 μm. Photobiont chlorococcoid. Spot tests: soralia/medulla K- or (rarely) K+ pale yellow, C-, KC-, P- or (rarely) P+ pale yellow-orange. Chemistry: thallus with confluentic acid (major), 2’-0-methylperlatolic and 2’-0-methylmicrophyllinic acids, rarely with additional stictic, norstictic and cryptostictic acids.

Note: on horizontal to moderately inclined surfaces of siliceous rocks lying on or near the ground in scree fields, mostly in upland areas; for a long time treated as a sorediate morph of P. flavicunda; some records are likely hidden among those of that species.

Growth form: Crustose

Substrata: rocks

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly asexual, by soredia, or soredia-like structures (e.g. blastidia)

Commonnes-rarity: (info)

Alpine belt: very rare

Subalpine belt: very rare

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:

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:

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4

5

6

(info)

Predictive model

Index Fungorum GBIF

Einar Timdal - Source: http://nhm2.uio.no/lav/web/index.html - CC BY-NC

Curtis Randall Björk, - CC BY-SA 4.0

Boundary Ranges, British Columbia, Canada
18.08.2018