Cetraria oakesiana Tuck.

Boston J. Nat. Hist., 3: 445, 1841.
Synonyms: Allocetraria oakesiana (Tuck.) Randlane & A. Thell; Cetraria bavarica Kremp.; Platysma oakesianum (Tuck.) Nyl.; Tuckermannopsis oakesiana (Tuck.) Hale; Usnocetraria oakesiana (Tuck.) M.J. Lai & J.C. Wei
Distribution: N - Frl (Nascimbene & al. 1998), Ven (Nascimbene & Caniglia 2003c, Watson 2014), TAA (Nascimbene & Caniglia 2000b, Nascimbene & al. 2007b, 2014, Nascimbene 2014, Nimis & al. 2015).
Description: Thallus foliose, dorsiventral, rather closely adnate, forming very irregular patches. Lobes 4-10 mm wide, elongated, usually concave, with raised, white-sorediate margins. Upper surface yellowish green, smooth and somewhat shiny; lower surface tan to pale brown, with scattered, simple or forked, pale brown rhizines, without pseudocyphellae. Upper and lower cortex paraplectenchymatous, rather thin, with thick-walled cells; medulla white. Apothecia extremely rare (not found in Italian material), zeorine, usually submarginal, up to 7 mm across, with a pale brown disc. Asci 8-spored, clavate, Lecanora-type. Ascospores 1-celled, hyaline, subglobose, c. 5 μm wide. Pycnidia rare, black, marginal, projecting. Conidia sublageniform, 7-11 x 0.8-1 μm. Photobiont chlorococcoid. Spot tests: upper cortex and medulla K-, C-, KC- P-. Chemistry: upper cortex with usnic acid; medulla with caperatic, lichesterinic and protolichesterinic acids.
Note: a cool-temperate to boreal-montane, incompletely circumpolar species found on basal parts of conifers in humid-cold montane forests, more rarely on lignum (e.g. on stumps); restricted to the Alps in Italy. It is included in the Italian red list of epiphytic lichens as “Vulnerable” (Nascimbene & al. 2013c).
Growth form: Foliose, broad lobed
Substrata: bark
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly asexual, by soredia, or soredia-like structures (e.g. blastidia)
Subcontinental: restricted to areas with a dry-subcontinental climate (e.g. dry Alpine valleys, parts of Mediterranean Italy)

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:

(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




Mark Rahill CC BY-SA 4.0
USA



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Italy, Friuli Venezia Giulia, Udine, Passo del Pura, Ampezzo Carnico, 1400 m
09.09.2016


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


Mark Rahill - CC BY-SA 4.0
USA



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (9727)
2001/12/05



P. L. Nimis - CC BY-SA 4.0
TSB 43754



P. L. Nimis - CC BY-SA 4.0
TSB 43754