Pyrenodesmia variabilis

Ciri dan struktur

Pyrenodesmia variabilis has a crust-like (crustose) thallus, which is grey to grey-brown, generally thin and somewhat smooth. Rarely, the colour is white. The thallus is , meaning it has small, rounded, distinct patches. The central area of the thallus is darker than its edges, which may be bordered by a black prothallus. The partner is a member of the green algal genus Trebouxia. Its apothecia, the fruiting bodies, are up to 1 mm in diameter. These apothecia are either sparsely scattered or densely crowded on the thallus surface, and they are , meaning they are attached directly without a stalk. Initially flat, they tend to become slightly convex as they mature. The apothecia often have a thick, persistent margin with a grey-blue powdery () appearance. The of the apothecia is black, while the , the layer above the spore-producing asci, is pale. The paraphyses, which are slender filament-like structures in the hymenium (spore-producing layer), broaden and become stouter towards their tips, reaching about 3 μm in diameter. The of Pyrenodesmia variabilis number eight per ascus and are ellipsoid in shape, measuring 14–16 by 7–9 μm. They are , with a septum (an internal dividing partition) that is 2–3 μm wide and can sometimes be as long as a third of the total length of the spore. When the thallus is treated with a solution of potassium hydroxide (i.e., the K spot test), it shows no reaction (K−), while the epithecium turns purple upon contact with this chemical (K+ purple).

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Rujukan: [1]

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Habitat dan peran ekologis

Pyrenodesmia variabilis thrives on nutrient-rich limestone environments, flourishing on both natural boulders and human-made stonework. It is often found on horizontal surfaces such as the tops of chest tombs and the copings of walls and bridges. It is generally , meaning that it grows on the surface of rocks, but in a few instances, it has been recorded as –growing in the interior of rocks, under and around the rock crystals. This species is widespread throughout England and Wales, including the English Midlands, with a distribution that extends sporadically to Scotland and Ireland. It also occurs in Bulgaria, Greece, Ukraine, and Russia. Pyrenodesmia variabilis is also found in the Northern Hemisphere, reaching as far as Central America. Its Asian distribution includes Nepal, where it has been reported from 2,000 to 3,500 m elevation in a compilation of published records. In Western Asia, it occurs in Iraq and Turkey.

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Habitat atau konteks temuan

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Substrat

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Peran atau konteks

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Reproduksi

Its apothecia, the fruiting bodies, are up to 1 mm in diameter. These apothecia are either sparsely scattered or densely crowded on the thallus surface, and they are , meaning they are attached directly without a stalk. Initially flat, they tend to become slightly convex as they mature. The apothecia often have a thick, persistent margin with a grey-blue powdery () appearance. The of the apothecia is black, while the , the layer above the spore-producing asci, is pale. The paraphyses, which are slender filament-like structures in the hymenium (spore-producing layer), broaden and become stouter towards their tips, reaching about 3 μm in diameter. The of Pyrenodesmia variabilis number eight per ascus and are ellipsoid in shape, measuring 14–16 by 7–9 μm.

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Rujukan: [1]

Catatan identitas dan cakupan

• Nama diterima mengikuti Catalogue of Life Base2026-09-11; uraian mempertahankan konsep dan nama sumber aslinya.
• Original geographic, specimen and life-cycle scope retained; source import awaits individual editorial review.
• Impor dan terjemahan otomatis belum diperiksa editorial per profil. Struktur reproduktif yang disebutkan tidak membuktikan seluruh siklus hidup diketahui.
• Pengukuran pada uraian mengikuti spesimen, kultur, dan metode sumber; angka tidak diperluas ke semua populasi.

Melihat dengan konteks

Dokumentasi Pyrenodesmia variabilis menurut asosiasi foto pada record takson iNaturalist. Kredit: Valerii Darmostuk. Identitas mengikuti sumber; bukan penentuan spesimen independen.

Jenis

Fotografi

Kredit

(c) Valerii Darmostuk, some rights reserved (CC BY), uploaded by Valerii Darmostuk

Lisensi

CC BY 4.0

Sumber media

Buka entri sumber

Gambar menunjukkan objek menurut identifikasi sumber, bukan verifikasi independen spesimen oleh Fungi. Tidak ada skala baru yang ditambahkan.

Sumber profil

1. [1] Pyrenodesmia variabilis — Wikipedia (en)Bagian sumber: Frozen revision 1353399954
   Tanggal penghimpunan sumber: 2026-10-12
   Teks sumber: CC BY-SA4.0 · Wikipedia contributors
2. [2] Catalogue of Life Base2026-09-11 — Pyrenodesmia variabilisBagian sumber: ColDP NameUsage.tsv ID 4QRNT; accepted species; source 2073
   Tanggal penghimpunan sumber: 2026-10-12
3. [3] Dokumentasi visual — Pyrenodesmia variabilisBagian sumber: Individual media record; identification follows the source, not independent determination
   Tanggal penghimpunan sumber: 2026-10-12
   Media sumber: CC BY 4.0 · (c) Valerii Darmostuk, some rights reserved (CC BY), uploaded by Valerii Darmostuk