ITALIC 8.0

Porpidia contraponenda (Arnold) Knoph & Hertel

in Hertel & Knoph, Mitt. bot. Staatss. München, 20: 477, 1984. Basionym: Lecidea contraponenda Arnold - Verh. zool.-bot. Ges. Wien, 36: 79, 1886.

Synonyms:

Distribution: N - TAA.

Description: Thallus crustose, episubstratic, rather thin, rimose to rimose-areolate, the areoles polygonal, slightly convex, sometimes minutely papillate to verrucose, whitish, grey-white or cream-coloured, rarely delimited by a thin dark prothallus (especially when forming mosaics); soredia rarely present, blue-grey. Medulla white, I-. Apothecia lecideine, often confluent, rounded or irregular in outline, at first slightly immersed then sessile, 0.3-1(-1.5) mm across, with a concave to finally slightly convex, black but sometimes bluish-pruinose disc, and a rather thick, slightly raised, finally often excluded proper margin. Proper exciple brown-black in outer part, dark brown within, the outer hyphae to c. 6 µm thick; epithecium olive-green to greenish-brown, N+ purple-red; hymenium colourless, 60-130 μm high; paraphyses coherent, 1.5-2.0 μm thick, branched and anastomosing, the apical cells only slightly thickened; hypothecium dark brown, 65-75 μm high. 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, 13-21(-25) x 5-9(-11) µm, halonate at least when young. Photobiont chlorococcoid. Spot tests: thallus and medulla K-, C-, KC-, P-. Chemistry: 2’-0-methylmicrophyllinate and 2’-0-methylmicrophyllinic acid.

Note: on siliceous rocks near the ground, e.g. on large pebbles, in humid-moist situations, in open forests on track sides and in shrublands, most frequent in upland areas but generally rare.

Growth form: Crustose

Substrata: rocks

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly sexual

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

Index Fungorum GBIF

André Aptroot - Source: http://www.tropicallichens.net/ CC BY-SA-NC

Author: André Aptroot - Source: http://www.tropicallichens.net/ CC BY-SA-NC