Calicium glaucellum
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| Calicium glaucellum | |
|---|---|
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Scientific classification  | |
| Kingdom: | Fungi |
| Division: | Ascomycota |
| Class: | Lecanoromycetes |
| Order: | Caliciales |
| Family: | Caliciaceae |
| Genus: | Calicium |
| Species: | C. glaucellum |
| Binomial name | |
| Calicium glaucellum Ach. (1803) | |
Calicium glaucellum is a crustose lichen that is found growing on trees throughout much of the world. The species is similar to Calicium abietinum.[2]
The species is commonly found in northern boreal to temperate zones in North, Central, and South America[3] and the South West region of Western Australia.[4]
This lichen has a lichenized life habit. Its thallus is typically immersed, but can rarely be superficial and then thin, indistinct, and dark grayish green with a granular appearance.[5]
The apothecia of C. glaucellum usually have a faint white pruina, at least along the edge (upper part) of the exciple and below the capitulum. They are 0.5-1 mm tall and 4-9 times as high as the width of the stalk.[2][5]
The stalk is shiny black, 0.11-0.17 mm wide, and consists of blackish brown to dark aeruginose, irregularly interwoven and strongly sclerotized hyphae that become paler towards the surface. The outermost layer of the stalk is paler and has a distinct, gelatinous, hyaline coat.[5]
The capitulum is obovoid to lenticular, measuring 0.23-0.34 mm in diameter. The exciple is dark brown to aeruginose, composed of elongated to almost isodiametric sclerotized hyphae that are paler in the outer part and distinctly anticlinally arranged. The hypothecium is dark brown with a flat or slightly convex upper surface.[5]
The asci are cylindrical, 35-41 μm x 3.5-4.5 μm, and contain uniseriate spores. The ascospores are ellipsoid, 9-13 x 4-6.5 μm, with a coarse irregular ornamentation of cracks and ridge fragments. Semi-mature spores have a very irregular sulcate pattern, mainly with longitudinally arranged ridges disrupted by irregular cracks.[5]
Pycnidia are frequently present, producing narrowly cylindrical conidia that are 4-5 x 0.8 μm.[5]