Haematomma ochroleucum var. porphyrium (Pers.) J.R. Laundon

Lichenologist, 4: 300, 1970. Basionym: Lichen haematomma var. porphyrius Pers. - Ann. Bot. (Usteri), 5: 17, 1794.
Synonyms: Haematomma coccineum var. porphyrium (Pers.) Th. Fr.; Haematomma porphyrium (Pers.) Zopf; Lecanora haematomma Ach. p.p.
Distribution: N - Ven, TAA (Nascimbene & al. 2007b), Lomb, Piem (Isocrono & al. 2004, Isocrono & Piervittori 2008). C - Tosc (Loppi & al. 1997b, 1998), Umb (Ravera & al. 2006), Laz (Ruisi & al. 2005), Sar (Monte 1993, Nöske 2000, Rizzi & al. 2011). S - Camp (Catalano & al. 2016), Cal (Puntillo 1996), Si (Nimis & al. 1994, Caniglia & Grillo 2006b).
Description: Thallus crustose to subleprose, episubstratric, white to pale grey-white, forming large patches delimited by a cottony, fimbriate, whitish prothallus. Soredia abundant, granulose, 30-120 µm across, finally covering almost the entire thallus surface, giving it a subleprose appearance. Apothecia rare in epiphytic samples, more common in epilithic ones, lecanorine, 0.5-3 mm diam., at first immersed in the thallus, then subsessile and finally often immarginate, with a scarlet red disc and a sorediate thalline margin. Epithecium scarlet red, K+ dark purple-red; hymenium colourless; paraphyses richly branched, especially in upper part; hypothecium colourless. Asci 8-spored, with an amyloid apical dome, approaching the Lecanora-type. Ascospores 3-7-septate, hyaline, fusiform, 30-70 x 5-7 µm. Pycnidia immersed, red in upper part, c. 0.2 mm diam. Conidia thread-like, strongly curved, 12-20 x 0.5-0.7 μm. Photobiont: chlorococcoid. Spot tests: thallus and soredia K+ pale yellow then brownish, C-, KC-, P+ pale yellow, UV-; disc of apothecia and top of pycnidia K+ dark purple-red. Chemistry: thallus with atranorin, zeorin, and porphyrilic acid; apothecia and pycnidia with anthraquinones (haematommone).
Note: a mild-temperate taxon, much rarer on bark than the typical variety, and perhaps slightly less photophytic.
Growth form: Crustose
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly asexual, by soredia, or soredia-like structures (e.g. blastidia)
Most common in areas with a humid-warm climate (e.g. most of Tyrrenian Italy)
In underhangs rarely wetted by rain

Commonnes-rarity: (info)

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

Leif Stridvall - Source: http://www.stridvall.se/la/galleries.php (Courtesy: Anita Stridvall)



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (11833)
2001/12/12
sterile sorediate thallus



E. Pittao; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (TSB 13242)
20.10.2009



E. Pittao; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (TSB 13242)
20.10.2009



E. Pittao; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (TSB 13242)
20.10.2009



Felix Schumm – CC BY-SA 4.0
[2297], Österreich, Zillertaler Alpen



Felix Schumm – CC BY-SA 4.0
[2297], Österreich, Zillertaler Alpen



Felix Schumm – CC BY-SA 4.0
[2297], Österreich, Zillertaler Alpen



Felix Schumm – CC BY-SA 4.0
[2297], Österreich, Zillertaler Alpen



P.L. Nimis CC BY-SA 04
TSB 37520



P.L. Nimis CC BY-SA 04
TSB 37520



P.L. Nimis CC BY-SA 04
TSB 37520



P.L. Nimis CC BY-SA 04
TSB 37520



P.L. Nimis CC BY-SA 04
TSB 37520