Marchantiana asserigena (J. Lahm) Søchting & Arup

Graphis Scripta, 30, 6: 119, 2018.. Basionym: Callopisma asserigenum J. Lahm - Zusammenst. westfal. Flech.: 107, 1883.
Synonyms: Blastenia assigena Arnold; Caloplaca asserigena (J. Lahm) Della Torre & Sarnth.; Caloplaca assigena (Arnold) Dalla Torre & Sarnth.
Distribution: N - Frl.
Description: Thallus crustose, endosubstratic or thinly episubstratic and continuous to cracked, grey (rarely brown or brownish black), forming small paches to 7 mm in diam., densely covered with apothecia. Apothecia common, often crowded, 0.2-0.5 mm across, with a flat, rusty-red to finally blackish, pruinose disc and an hardly raised, thin, irregular, finally excluded, grey-white margin. Epithecium brownish red, granular, K+ red; hymenium colourless or yellowish, K- or K+ slightly purple, 50-60(-70) µm high; paraphyses branched in upper part, c. 1.5 µm thick at base, the apical cells up to 4.5 µm wide; hypothecium colourless. Asci 8-spored, clavate, Teloschistes-type. Ascospores 1-septate, polarilocular, hyaline, ellipsoid, 9-14 x 5-7(-7.5) µm, the septum 3-6 µm thick (1/3-1/4 of spore length). Photobiont chlorococcoid. Spot tests: thallus K-, C-, KC-, P-; apothecial disc K+ red. Chemistry: thallus without lichen substances; apothecia with neochloroemodin.
Note: this species, related to a group of Southern Hemisphere Teloschistaceae, seems to be quite common in eu-oceanic habitats of Eurasia (Macaronesia, Norway, Caucasus), and also in foggy forests, usually on twigs of conifers or shrubs; in Italy it is evidently rare.
Growth form: Crustose
Substrata: lignum
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly asexual, by soredia, or soredia-like structures (e.g. blastidia)

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: very 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:

12345

Solar irradiation:

12345

Aridity:

12345

Eutrophication:

12345

Poleotolerance:

0123

Altitudinal distribution:

123456


Predictive model


Felix Schumm; Owner: Felix Schumm - CC BY-SA 4.0
[B 60 0190879], Austria, Tirol, Achensee, forest near Pertisau, on dry twigs of Larix decidua. 47°26' N, 11°41' E . Leg. V. Grummann, 8. August 1958, det H. Sipman, 2013.



Felix Schumm; Owner: Felix Schumm - CC BY-SA 4.0
[B 60 0190879], Austria, Tirol, Achensee, forest near Pertisau, on dry twigs of Larix decidua. 47°26' N, 11°41' E . Leg. V. Grummann, 8. August 1958, det H. Sipman, 2013.



Felix Schumm; Owner: Felix Schumm - CC BY-SA 4.0
[B 60 0190879], Austria, Tirol, Achensee, forest near Pertisau, on dry twigs of Larix decidua. 47°26' N, 11°41' E . Leg. V. Grummann, 8. August 1958, det H. Sipman, 2013.



Felix Schumm; Owner: Felix Schumm - CC BY-SA 4.0
[B 60 0190879], Austria, Tirol, Achensee, forest near Pertisau, on dry twigs of Larix decidua. 47°26' N, 11°41' E . Leg. V. Grummann, 8. August 1958, det H. Sipman, 2013.



Felix Schumm; Owner: Felix Schumm - CC BY-SA 4.0
[B 60 0190879], Austria, Tirol, Achensee, forest near Pertisau, on dry twigs of Larix decidua. 47°26' N, 11°41' E . Leg. V. Grummann, 8. August 1958, det H. Sipman, 2013.



Felix Schumm; Owner: Felix Schumm - CC BY-SA 4.0
[B 60 0190879], Austria, Tirol, Achensee, forest near Pertisau, on dry twigs of Larix decidua. 47°26' N, 11°41' E . Leg. V. Grummann, 8. August 1958, det H. Sipman, 2013.



Felix Schumm; Owner: Felix Schumm - CC BY-SA 4.0
[B 60 0190879], Austria, Tirol, Achensee, forest near Pertisau, on dry twigs of Larix decidua. 47°26' N, 11°41' E . Leg. V. Grummann, 8. August 1958, det H. Sipman, 2013.



Felix Schumm; Owner: Felix Schumm - CC BY-SA 4.0
[B 60 0190879], Austria, Tirol, Achensee, forest near Pertisau, on dry twigs of Larix decidua. 47°26' N, 11°41' E . Leg. V. Grummann, 8. August 1958, det H. Sipman, 2013.



Felix Schumm; Owner: Felix Schumm - CC BY-SA 4.0
[B 60 0190879], Austria, Tirol, Achensee, forest near Pertisau, on dry twigs of Larix decidua. 47°26' N, 11°41' E . Leg. V. Grummann, 8. August 1958, det H. Sipman, 2013.



Felix Schumm; Owner: Felix Schumm - CC BY-SA 4.0
[B 60 0190879], Austria, Tirol, Achensee, forest near Pertisau, on dry twigs of Larix decidua. 47°26' N, 11°41' E . Leg. V. Grummann, 8. August 1958, det H. Sipman, 2013.



Felix Schumm; Owner: Felix Schumm - CC BY-SA 4.0
[B 60 0190879], Austria, Tirol, Achensee, forest near Pertisau, on dry twigs of Larix decidua. 47°26' N, 11°41' E . Leg. V. Grummann, 8. August 1958, det H. Sipman, 2013.



Felix Schumm; Owner: Felix Schumm - CC BY-SA 4.0
[B 60 0190879], Austria, Tirol, Achensee, forest near Pertisau, on dry twigs of Larix decidua. 47°26' N, 11°41' E . Leg. V. Grummann, 8. August 1958, det H. Sipman, 2013.



Felix Schumm; Owner: Felix Schumm - CC BY-SA 4.0
[B 60 0190879], Austria, Tirol, Achensee, forest near Pertisau, on dry twigs of Larix decidua. 47°26' N, 11°41' E . Leg. V. Grummann, 8. August 1958, det H. Sipman, 2013.



Felix Schumm; Owner: Felix Schumm - CC BY-SA 4.0
[B 60 0190879], Austria, Tirol, Achensee, forest near Pertisau, on dry twigs of Larix decidua. 47°26' N, 11°41' E . Leg. V. Grummann, 8. August 1958, det H. Sipman, 2013.