Porpidia crustulata (Ach.) Hertel & Knoph

Data Set Maintenance: Data set standard item. Data set author(s): Hertel H. (C. Kainz, 03-06-03). Data set not revised.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: species. Porpidia. Synonyms: Lecidea crustulata (Ach.) Spreng., Biatora crustulata (Ach.) Hepp, Lecidea platycarpa var. crustulata (Ach.) Oliv., Haplocarpon crustulatum (Ach.) Choisy, Huilia crustulata (Ach.) Hertel; Lecideaceae Chevall. (1826) @EXCL@ Porpidiaceae Hertel & Hafellner (1984); Lecanorales.

Type Information: Basionym: Lecidea parasema δ. (L.) crustulata Ach., Lichenogr. Univ.: 176 (1810).

Taxonomic Literature: Taxonomic notes: Thallus cortex 10-35 µm thick, upper cell layer colourless, occasionally incrusted with rusty coloured granules; hyphae c. 3-5 µm diam.; epinecral layer mostly not developed;
Algal layer c. 60-65 µm thick; algal cells c. 9-10 µm, max. c. 14 µm diam.;
Medulla I-; hyphae 3.5-4 µm thick;
Hypothallus grey to black, more or less obvious between the areoles and/or at the thallus margin;
Paraphyses branched and anastomosing, 1.2-1.8 µm, apices 2-3 µm thick;
Pycnidia immersed;
Asci c. 55-70 x 11-15 µm;. Rambold G., Biblioth. Lichenol. 34: 1-346 (1989).

Biogeography: Cosmopolitan.

Ecology: Biotroph; lichenized; episubstratic; substrate non-calciferous.

Thallus: Indistinct or crustose (verrucose to rimose, areoles irregularly shaped, with rough surface, c. 0.4-0.5 mm, max. 0.8 mm diam.); separate thallus parts.05-.2 mm thick. Thallus Size and Differentiation: Large (up to 60 mm diam.). Upper Surface: White (occasionally more or less rusty coloured; creamy), plane.

Ascocarps: Forming independently from the host thallus or mycelium (round to roundish, dispersed to crowded), soon sessile, strongly constricted at the base, 25-90 per cm², .5-(1.5) mm in diam.. Margin: More or less persistent, distinct (at first), 60-120 µm wide. Disk: Plane or weakly convex, black (matt), epruinose. Exciple: Brown (to dark brown). Epithecium: Apical cells olive ('olivaceous'). Hymenium: 60-110 µm high; white (I+ blue, Iconc+ blue). Subhymenium: 10-20 µm high; white. Hypothecium: Dark brown (150-270 µm thick).

Ascospores: Ellipsoid, (9)-9.7-13.7-(18) µm long, (6)-6.9-7.2-(9.5) µm wide.

Conidia: 9-10.6-14 µm long.

Secondary Metabolites: Norstictic acid (and constictic acid (?); two chemotypes observed) or stictic acid.

Spot Tests: Medulla: K –, C –, PD – ascocarp margin (in section): K + deep yellow, C – (P +/- orange).

(report generated 04.Okt.2007)