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Data Set Maintenance: Data set standard item. Data set author(s): Hertel H. (99-01-01). Data set not revised.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: species. Cecidonia. Synonyms: Lecidea alumnula Nyl., Lecidea umbonella v. alumnula (Nyl.) Hertel, Lecidea dealbatula Nyl., Lecidea deparcula Nyl., Lecidea hymeneliicola Alstrup & D.Hawksw., Lecidea subumbonella Lamy; Lecideaceae Chevall. (1826); Lecanorales.

Type Information: Protologue: Rambold G., Triebel D., Nova Hedwigia 47: 279-309 (1988) - Placographa xenophana Körb.: Körber G.W., Parerga Lichenol. 464 (1865); type specimen label data: Poland: "Sudeten" (on Porpidia contraponenda) (L-Koerb 910.204-562).

Taxonomic Literature: Taxonomic notes: A cecidiogenous species. The "thallus", as described here, is a gall formed by the host-lichen and therefore reflects host-lichen characters. Triebel D., Biblioth. Lichenol. 35: 132-134 (1989); Rambold H., Triebel D., Biblioth. Lichenol. 48: 106 (1992); Hertel H., Biblioth. Lichenol. 58: 153 (1995).

Biogeography: Montane and alpine. Continent: Europe (Au, Br, Cz, Hb, Hi, Is, No, Su) and Africa (Canary Islands).

Ecology: Biotroph (cecidogonous; matrix: Porpidia div. spec.); lichenicolous (cecidogonous; matrix: Porpidia div. spec.); episubstratic (endosubstratic, however giving the impression of being episubstratic). Host or Phorophyte Taxonomy: Porpidia.

Thallus: Not subdivided parts, continuous throughout; separate thallus parts 0-.4 mm thick. Thallus Size and Differentiation: Small; main branches basally not constricted. Thallus Outline: Margin concolorous the thallus centre. Upper Surface: Verrucose, white, lemon (citrine), brownish yellow, or pale grey, plane; not sorediate; without thalloconidia thalloconidia.

Ascocarps: Soon sessile, not constricted or slightly constricted at the base, 80-250 per cm², .2-.3-(.5) mm in diam.. Margin: Not flexuose, persistent, 30-75 µm wide, epruinose. Disk: Plane, black, epruinose, without an umbo, forming occasionally, on few disks only or forming regularly, on all disks. Exciple: Hyphae radiating outwards; 3.5-4 µm wide; brown; not inspersed with crystals. Epithecium: Apical cells olive, green, or brownish yellow, cell pigment reacting with 10% HCl (in H2O). Hymenium: 50-80 µm high; white; iodine reaction: Lugol’s positive. Subhymenium: 10-15 µm high; white. Hypothecium: Brown.

Ascospores: Ellipsoid, (9)-10.2-12.7-(13) µm long, (5)-4.7-6.8-(7.5) µm wide; wall not ornamented.

Conidia: (5.5)-(not clear wether belong to the parasite or host) 5.5-8-(8) µm long.

Secondary Metabolites: Not detected or present, confluentic acid, 2'-O-methylmicrophyllinic acid, 2'-O-methylperlatolic acid, norstictic acid, or stictic acid.

Spot Tests: Medulla: K – or + yellow (depending from the reaction of the host thallus), C –, PD – ascocarp margin (in section): K –, C – disk: C – hypothecium: K – epihymenium: K –.

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