ITALIC 8.0

Chaenotheca xyloxena Nádv.

Repert. Spec. Nov. Regni Veg., 36: 308, 1934.

Synonyms: Chaenotheca nudiuscula (Schaer.) Nádv.

Distribution: N - Frl (Puntillo & Puntillo 2009), Ven (Thor & Nascimbene 2007, Nascimbene 2008c, Nascimbene & al. 2013b), TAA (Nascimbene & al. 2006e, 2007b, 2922, Puntillo & Puntillo 2009, Nascimbene 2013, Nimis & al. 2015), Lomb (Puntillo & Puntillo 2009). C - Tosc (Benesperi & al. 2007), Abr (Ravera 2002b). S - Bas (Puntillo & Puntillo 2009), Cal (Puntillo 1994, 1996, Puntillo & Puntillo 2009).

Description: Thallus crustose, endosubstratic, poorly evident, sometimes appearing as a greenish or grey stain on the substrate. Apothecia stalked, pin-like, 0.9-1.6 mm high, the stalk slender, 0.04-0.08 mm thick, shining black in lower part, usually white-pruinose in upper part, consisting of periclinally arranged, medium brown hyphae. Capitulum 0.2-0.3 mm across, obconical, white-pruinose in lower part, with a well-developed, brown mazaedium. Exciple well-developed, cushion-like, the inner part of periclinally arranged hyphae, continuous with the stalk tissue, the outer part of swollen, anticlinally arranged hyphae; hypothecium obconical, pale brown, with a convex upper surface. Asci short-cylindrical or irregular, formed in chains, dissolving early, with 1-seriately to irregularly arranged spores. Ascospores 1-celled, brown to pale brown, globose, 3-4 µm wide, with a smooth to irregularly and thinly cracked wall. Photobiont chlorococcoid, with rectangular cells (Stichococcus). Spot tests: thallus K-, C-, KC-, P-. Chemistry: thallus without lichen substances.

Note: a cool-temperate to circumboreal-montane species found on hard and dry lignum, especially of conifers, in humid, montane to subalpine forests, more rarely on bark and lignum of deciduous trees, from the Alps to the mountains of Calabria. It is included in the Italian red list of epiphytic lichens as “Near-threatened” (Nascimbene & al. 2013c).

Growth form: Crustose

Substrata: bark and lignum

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly sexual

In underhangs rarely wetted by rain

Commonnes-rarity: (info)

Alpine belt: absent

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:

1

2

3

4

5

6

(info)

Predictive model

Herbarium samples

Index Fungorum GBIF

P.L. Nimis; Owner: Department of Life Sciences, University of Trieste

Herbarium: TSB (26093)
2001/12/05

Pier Luigi Nimis - CC BY-SA 4.0

TSB 41911

D. Puntillo CC BY-SA NC ND http://www.eseis.ut.ee/LichenPhoto_2200/Chaenotheca_cinerea_a1.jpg