ITALIC 8.0

Verrucaria rufofuscella Servít

Stud. Bot. Cech., 11: 21, 1950.

Synonyms:

Distribution: N - Lig.

Description: Thallus crustose, episubstratic, dull dark brown to reddish brown, rimose-areolate, 0.20-0.35 mm thick, thinner and broken up into smaller dispersed areoles in peripheral parts, sometimes delimited by a pale prothallus, the areoles irregularly roundish-angular, flat, 0.3-0.7(-1) mm wide, with partly subascending and finely crenulated margins. Cortex poorly developed, pale brown in uppermost part, sometimes overlain by a very thin epinecral layer; algal layer irregular, inspersed with crystals; medulla white to pale brown, with substrate particles, without a black basal layer. Perithecia black, 1(-3) per areole, largely immersed but the apical part projecting, naked. Involucrellum adpressed to exciple, extending to base-level and more or less incurved beneath exciple, apically and laterally 30-40 µm thick, thinning at base; exciple subglobose, 0.25-0.4 mm across, the wall 15-25 µm thick, black in upper part, paler in basal part; hamathecium of mostly simple, 20-30 µm long periphyses and periphysoids, interascal filaments absent; hymenial gel hemiamyloid, I+ red (I+ blue at very low concentrations of I), K/I+ blue. Asci 8-spored, clavate, I-, fissitunicate, the wall thickened above, with an ocular chamber, dehiscent by extrusion of an endotunica to form a delicate rostrum, Verrucaria-type. Ascospores 1-celled, hyaline, ellipsoid, 20-25 x 11-13 µm. Photobiont chlorococcoid. Spot tests: K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.

Note: a long-forgotten species of siliceous rocks, described from Germany and recently resurrected in the 3rd volume of the Lichen Flora of the Greater Sonoran Region (Nash & al. 2007), where it is reported from southwestern North America, with a good description. In overall appearance it resembles V. fuscoatroides, which mainly differs in having a considerably thicker involucrellum.

Growth form: Crustose

Substrata: rocks

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly sexual

Poorly known taxon in need of further study

Commonnes-rarity: (info)

Alpine belt: absent

Subalpine belt: absent

Oromediterranean belt: absent

Montane belt: absent

Submediterranean belt: absent

Padanian area: absent

Humid submediterranean belt: absent

Humid mediterranean belt: very rare

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: Servit, M 1949: Nove nebo mene zname druhy lisejnikove celedi Verrucariaceae. Species Verrucariacearum (Lichenes) novae vel minus cognitae. - Sbornik Narodniho Musea v Praze 5(9): 1-51. Tab.3 - Public Domain