Rhizocarpon petraeum

Ciri dan struktur

Rhizocarpon petraeum forms a thin, rock-hugging crust that may spread over an area up to about 5 cm across. The thallus is usually continuous but develops fine cracks () as it ages, and small angular tiles () to 0.5 mm wide sometimes appear in patches. These areoles are chalk-white to mid-grey and have a , dull finish. A narrow, black —an advancing line of fungal threads—may be visible where the colony meets bare stone. Internally, a quick potassium hydroxide (K) spot test on the white medulla yields a yellow stain, and para-phenylenediamine (Pd) produces an orange reaction, both indicating the presence of stictic acid. Black apothecia, the sexual fruit-bodies, are scattered across the thallus and rarely exceed 1 mm in diameter. Each is flat, glossy rather than frosted (non-), and typically round. The surrounding fungal wall () remains prominent; under a hand lens it may show a faint pale dusting, and in thin section its outer rim is brown to dark blue-green while the inner margin is pale. Crystals within this wall dissolve and flash yellow when touched with K. Immediately above the spore layer sits an olive-brown that reacts the same way, turning yellow as its crystals dissolve. The spore-bearing hymenium beneath is colourless and comparatively tall (150–200 μm), supported by a dark-brown that does not change with K. Each club-shaped ascus contains eight ascospores that are large (20–50 × 13–25 μm) and —internally divided into many chambers like a brick wall. The spores are initially clear but darken as they over-mature.

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Rujukan: [1]

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Habitat dan peran ekologis

Rhizocarpon petraeum is a species of saxicolous (rock-dwelling) crustose lichen in the family Rhizocarpaceae. It is widely distributed in Europe. This lichen forms a thin, chalk-white to grey crust that spreads over rock surfaces up to about 5 cm across, with scattered black disc-shaped fruiting bodies that rarely exceed 1 mm in diameter. It grows on sedimentary and volcanic rocks such as trachyte and basalt, and was first described in 1787 from specimens found in various locations across Europe.

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Rujukan: [1]

Habitat atau konteks temuan

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Substrat

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Peran atau konteks

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Reproduksi

Black apothecia, the sexual fruit-bodies, are scattered across the thallus and rarely exceed 1 mm in diameter. Each is flat, glossy rather than frosted (non-), and typically round. The surrounding fungal wall () remains prominent; under a hand lens it may show a faint pale dusting, and in thin section its outer rim is brown to dark blue-green while the inner margin is pale. Crystals within this wall dissolve and flash yellow when touched with K. Immediately above the spore layer sits an olive-brown that reacts the same way, turning yellow as its crystals dissolve. The spore-bearing hymenium beneath is colourless and comparatively tall (150–200 μm), supported by a dark-brown that does not change with K.

Sebagian uraian ditampilkan dalam bahasa sumber; terjemahannya belum tersedia atau belum lolos pemeriksaan.

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 Rhizocarpon petraeum dari Wikimedia Commons. Rhizocarpon petraeum (habitat:West Tatra Mountains) Identifikasi mengikuti record berkas sumber.

Jenis

Fotografi

Kredit

Jerzy Opioła

Lisensi

CC BY-SA 3.0

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] Rhizocarpon petraeum — Wikipedia (en)Bagian sumber: Frozen revision 1296276082
   Tanggal penghimpunan sumber: 2026-10-12
   Teks sumber: CC BY-SA4.0 · Wikipedia contributors
2. [2] Catalogue of Life Base2026-09-11 — Rhizocarpon petraeumBagian sumber: ColDP NameUsage.tsv ID 4SC5Y; accepted species; source 2073
   Tanggal penghimpunan sumber: 2026-10-12
3. [3] Dokumentasi visual — Rhizocarpon petraeumBagian sumber: Individual media record; identification follows the source, not independent determination
   Tanggal penghimpunan sumber: 2026-10-12
   Media sumber: CC BY-SA 3.0 · Jerzy Opioła