Cecidonia umbonella (Nyl.) Triebel & Rambold

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 umbonella Nyl.; Lecideaceae Chevall. (1826); Lecanorales.

Type Information: Protologue: Rambold G., Triebel D., Nova Hedwigia 47: 279-309 (1988) - Lecidea umbonella Nyl.: Nylander W., Flora 49: 372 (1866); type specimen label data: Scotland, Perthshire, Ben More, Th. A. Jones (H-Nyl 15535a, lectotype).

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. Magnusson H., Ark. Bot. 2: 128 (1952); Tavares C.N., Revista Fac. Ci. Univ. Lisboa, 3: 370 (1954); Hertel H., Herzogia 1: 430 (1970); Hertel H., Herzogia 2: 499-500 (1973); Hertel 1975; Hertel H., Mitt. Bot. München 17: 178-179 (1981); Türk R., Wittmann H., Sauteria 3:230 (1987 - distrib. map for Salzburg, Austria); Triebel D., Biblioth. Lichenol. 35: 131-132 (1989); Hertel H., Mitt. Bot. München 30: 301 (1991); Hawksworth D.L., Coppins B.J. in Purvis O.W. et al. 336 (1992); Rambold H., Triebel D., Biblioth. Lichenol. 48: 106 (1992); Türk R., Poelt J., Österr. Akad. Wiss., Biosystematics and Ecology Ser. 3: 26 (1993 - bibliography of Austrian lichens); Hafellner J., Bull. Soc. Linn. Provence 44: 222 (1994); Hertel H., Biblioth. Lichenol. 58: 152-153 (1995).

Biogeography: Montane and alpine. Continent: Europe (Au, Br, Ga, Ge, He, Is, It, Lu, No, Rs, Sb, Su), Northern America (Greenland, USA (Alaska, Colorado)), and Asia-Temperate (Kavkas).

Ecology: Biotroph (cecidogenous; matrix: Lecidea lapicida, L. praenubila, L. promiscens, L. umbonata); lichenicolous (cecidogenous; matrix: Lecidea lapicida, L. praenubila, L. promiscens, L. umbonata); episubstratic (endosubstratic, however giving the impression to be episubstratic). Host or Phorophyte Taxonomy: Lecidea.

Thallus: Not subdivided parts, continuous throughout; lobes angular at the front; separate thallus parts.2-.6 mm thick. Thallus Size and Differentiation: Small; main branches basally not constricted. Thallus Outline: Margin concolorous the thallus centre. Upper Surface: White, lemon (citrine), brownish yellow, grey, or brown (usually pale), plane or convex; not sorediate; without thalloconidia thalloconidia.

Upper Cortex: Epicortex present. Medulla: Iodine reaction in Lugol's solution negative or in Lugol's solution positive.

Ascocarps: Soon sessile or becoming adnate, not constricted or slightly constricted at the base, 150-300 per cm², .3-.45-(.6) mm in diam.. Margin: Not flexuose, persistent, 60-120 µm wide, epruinose. Disk: Plane, black, epruinose, forming regularly, on all disks. Exciple: Hyphae radiating outwards; 3-4 µm wide; brown; not inspersed with crystals. Epithecium: Apical cells olive or turquoise (very pale), cell pigment reacting with 10% HCl (in H2O). Hymenium: 70-110 µm high; white; iodine reaction: Lugol’s positive, hemiamyloid. Subhymenium: 10-35 µm high; white. Hypothecium: Brownish yellow or brown.

Ascospores: Broadly ellipsoid or ellipsoid, (10)-11.1-14.9-(16) µm long, (6)-6.6-9.8-(10) µm wide; wall thick (two-layered), distinctly differentiated into primary and secondary wall (two-layered), not ornamented (two-layered).

Conidia: (5)-(not clear wether belong to the parasite or host) 5-9-(9) µm long.

Secondary Metabolites: Not detected or present, norstictic acid and stictic acid.

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

(report generated 04.Okt.2007)