Bellemerea subcandida (Arnold) Hafellner & Cl. Roux

in Clauzade & Cl. Roux, Bull. Soc. Bot. Centre-Ouest, n. sér. 15: 130, 1984. Basionym: Aspicilia cinereorufescens f. subcandida Arnold - Verh. zool.-bot. Ges. Wien, 47: 223, 1897.
Synonyms: Lecanora subcandida (Arnold) Lettau
Distribution: N - Ven, TAA, Piem (TSB 33985), Lig (TSB 33667b).
Description: Thallus crustose, episubstratic, rimose-areolate, chalky white to whitish grey, usually not delimited by a distinct prothallus. Cortex filled by crystals visible under polarized light, masking the cortical cells; medulla white, I+ blue; algal layer extending below the hypothecium. Apothecia cryptolecanorine-aspicilioid, immersed in the areoles, 0.3-1.5 mm across, with a flat to slightly convex, brown to black-brown disc (reddish brown when wet), a darker proper margin, and a thin, often rapidly excluded thalline margin. Proper exciple sometimes greenish in outer part, always colourless within; epithecium pale brown, N-; hymenium colourless, I+ blue; paraphyses branched and anastomosing in upper part, c. 2 µm thick, the apical cells not or only slightly swollen, usually with a thin, brown cap; hypothecium colourless, I+ pale blue. Asci 8-spored, clavate, approaching the Porpidia-type, with a less distinct tube structure. Ascospores 1-celled, hyaline, ellipsoid, 11-23 x 6-14 µm, the inner wall I+ blue or rarely I-, with a thin halonate epispore. Pycnidia dark, immersed. Conidia short-bacilliform. Photobiont chlorococcoid. Spot tests: thallus K-, C-, KC-, P-. Chemistry: without lichen substances.
Note: a probably overlooked and certainly more widespread, characteristic lichen of base-rich, weakly calciferous siliceous rocks in the mountains, known from southern Europe (Alps, Pyrenees); perhaps just a calcicolous morph of B. cinereorufescens.
Growth form: Crustose
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

Alpine belt: rare
Subalpine belt: extremely rare
Oromediterranean belt: absent
Montane belt: absent
Submediterranean belt: absent
Padanian area: absent
Humid submediterranean belt: absent
Humid mediterranean belt: absent
Dry mediterranean belt: absent


pH of the substrata:

(info)

1

2

3

4

5

Solar irradiation:

(info)

1

2

3

4

5

Aridity:

(info)

1

2

3

4

5

Eutrophication:

(info)

1

2

3

4

5

Poleotolerance:

(info)

0

1

2

3

Altitudinal distribution:

(info)

1

2

3

4

5





P.L. Nimis CC BY-SA 4.0
TSB 33667



P.L. Nimis CC BY-SA 4.0
TSB 33667