Lecania pusilla Tretiach

Lichenologist, 28: 9, 1995.
Synonyms:
Distribution: N - VG (Tretiach 1995), Frl (Tretiach 1996).
Description: Thallus crustose, inconspicuous, reduced to small grey-green granules near the apothecia or covering the stems and leaflets of the moss Fissidens cristatum. Apothecia very small, 0.1-0.3 mm across, convex to globular at maturity, with a yellowish disc turning greenish white when wet, soon immarginate, the young apothecia completely covered in a thick layer of white pruina, which in old apothecia persists only at the margins. Epithecium pale brown, covered with crystals which dissolve in N and K; hymenium colourless, strongly K/I+ blue, c 50 µm high; paraphyses septate, simple or sparingly branched in upper part, sometimes anastomosing, the apical cells up to 5-6 µm wide; hypothecium colourless, of strongly conglutinated hyphae, overlaying a thick layer of algal cells. Asci 8-spored, small (30-40 µm long), with a K/I+ blue tholus and a central non-amyloid area, Bacidia-type. Ascospores (0-)1-septate, hyaline, narrowly ellipsoid, thin-walled 15-19 x 2-5 µm. Pycnidia not seen. Photobiont chlorococcoid. Spot tests: K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: a very inconspicuous lichen found on calcicolous bryophytes inside deciduous woods; to be looked for in other parts of submediterranean Italy.
Growth form: Crustose
Substrata: soil, terricolous mosses, and plant debris
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

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

pH of the substrata:

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Solar irradiation:

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Aridity:

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Eutrophication:

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Poleotolerance:

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Altitudinal distribution:

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Predictive model
Herbarium samples


Felix Schumm; Owner: CC BY-SA 4.0
[TSB_18997], Slovenia, between Lokev and Divaca, Dolina Risnik, in a niche at the base of a trunk in Asaro-Carpinetum betuli, c. 330 m. Leg. M. Tretiach, 21.05.1990



Felix Schumm; Owner: CC BY-SA 4.0
[TSB_18997], Slovenia, between Lokev and Divaca, Dolina Risnik, in a niche at the base of a trunk in Asaro-Carpinetum betuli, c. 330 m. Leg. M. Tretiach, 21.05.1990



Felix Schumm; Owner: CC BY-SA 4.0
[TSB_18997], Slovenia, between Lokev and Divaca, Dolina Risnik, in a niche at the base of a trunk in Asaro-Carpinetum betuli, c. 330 m. Leg. M. Tretiach, 21.05.1990



Felix Schumm; Owner: CC BY-SA 4.0
[TSB_18997], Slovenia, between Lokev and Divaca, Dolina Risnik, in a niche at the base of a trunk in Asaro-Carpinetum betuli, c. 330 m. Leg. M. Tretiach, 21.05.1990



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (18997)
2003/03/12
detail of apothecium of the holotype



Felix Schumm - CC BY-SA 4.0
[TSB_18997], Slovenia, between Lokev and Divaca, Dolina Risnik, in a niche at the base of a trunk in Asaro-Carpinetum betuli, c. 330 m. Leg. M. Tretiach, 21.05.1990.



Felix Schumm - CC BY-SA 4.0
[TSB_18997], Slovenia, between Lokev and Divaca, Dolina Risnik, in a niche at the base of a trunk in Asaro-Carpinetum betuli, c. 330 m. Leg. M. Tretiach, 21.05.1990.



Felix Schumm - CC BY-SA 4.0
[TSB_18997], Slovenia, between Lokev and Divaca, Dolina Risnik, in a niche at the base of a trunk in Asaro-Carpinetum betuli, c. 330 m. Leg. M. Tretiach, 21.05.1990.



Felix Schumm - CC BY-SA 4.0
[TSB_18997], Slovenia, between Lokev and Divaca, Dolina Risnik, in a niche at the base of a trunk in Asaro-Carpinetum betuli, c. 330 m. Leg. M. Tretiach, 21.05.1990.



Felix Schumm - CC BY-SA 4.0
[TSB_18997], Slovenia, between Lokev and Divaca, Dolina Risnik, in a niche at the base of a trunk in Asaro-Carpinetum betuli, c. 330 m. Leg. M. Tretiach, 21.05.1990.



Felix Schumm - CC BY-SA 4.0
[TSB_18997], Slovenia, between Lokev and Divaca, Dolina Risnik, in a niche at the base of a trunk in Asaro-Carpinetum betuli, c. 330 m. Leg. M. Tretiach, 21.05.1990.



Felix Schumm - CC BY-SA 4.0
[TSB_18997], Slovenia, between Lokev and Divaca, Dolina Risnik, in a niche at the base of a trunk in Asaro-Carpinetum betuli, c. 330 m. Leg. M. Tretiach, 21.05.1990.



Felix Schumm - CC BY-SA 4.0
[TSB_18997], Slovenia, between Lokev and Divaca, Dolina Risnik, in a niche at the base of a trunk in Asaro-Carpinetum betuli, c. 330 m. Leg. M. Tretiach, 21.05.1990.



Felix Schumm - CC BY-SA 4.0
[TSB_18997], Slovenia, between Lokev and Divaca, Dolina Risnik, in a niche at the base of a trunk in Asaro-Carpinetum betuli, c. 330 m. Leg. M. Tretiach, 21.05.1990.



Felix Schumm - CC BY-SA 4.0
[TSB_18997], Slovenia, between Lokev and Divaca, Dolina Risnik, in a niche at the base of a trunk in Asaro-Carpinetum betuli, c. 330 m. Leg. M. Tretiach, 21.05.1990.