Porpidia hydrophila (Fr.) Hertel & A.J. Schwab

in Hertel, Beih. Nova Hedwigia, 79: 437, 1984.. Basionym: Lecidea hydrophila Fr. - K. svenska Vetensk-Akad. Handl., ser. 3: 256, 1822.
Synonyms:
Distribution:
Description: Thallus crustose, thinly episubstratic, continuous to rimose, creamy white to pale greyish orange, somehow shiny, sometimes poorly evident. Medulla white, I-. Apothecia lecideine, black, up to 2.5 mm across, usually scattered, round to irregular in outline, at first immerse but soon becoming sessile, with a subconcave to slightly convex (mostly flat) rarely whitish-pruinose disc, and a thick, prominent, often crenulated proper margin. Proper exciple with a dark, carbonaceous cortex and a much paler, pale brown interior composed of 2-4 µm thick, filamentous hyphae; epithecium bright emerald green, 12-25 µm high; hymenium colourless, 80-140 µm high; paraphyses conglutinated, richly branched and anastomosing; hypothecium dark. Asci 8-spored, elongate-clavate, with a thin, outer amyloid layer and a thickened tholus penetrated by a pore, the sides of which stain I/KI+ deep blue, Porpidia-type. Ascospores 1- celled, hyaline, ellipsoid, (14-)17-25 x 5.5-10 µm. Pycnidia usually very abundant. Conidia (8-)9-12 µm long. Photobiont chlorococcoid. Spot tests: thallus and medulla K-, C-, KC-, P-. Chemistry: thallus without lichen substances; epithecium with the Cinereorufa-green pigment.
Note: a species of semi-inundated siliceous rocks, often found along creeks; rare throughout Europe, most frequent in Western Europe at low elevations, with a few records from the Eastern Alps (Austria). To be looked for in Italy.
Growth form: Crustose
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
Periodically submerged (e.g. in creeks)

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: extremely rare
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
Index Fungorum GBIF

Leif Stridvall http://www.stridvall.se/la/galleries.php


Leif Stridvall - Source: http://www.stridvall.se/la/galleries.php


Leif Stridvall - Source: http://www.stridvall.se/la/galleries.php


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=416&lang=en
France, Huelgoat


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=416&lang=en
France, Loquefret


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=416&lang=en
France, Loquefret


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=416&lang=en
France, St. Herbot


Alain Gerault - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=416&lang=en
France, St. Herbot


Michel David - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=416&lang=en
France, Fraternitè


Jacques Haine - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=416&lang=en
Belgium, Charleroix


Jacques Haine - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=416&lang=en
France, Ardennes


Jacques Haine - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=416&lang=en
France, Ardennes


Jacques Haine - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=416&lang=en
France, Ardennes


Jacques Haine - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=416&lang=en
France, Ardennes