Lendemeriella exsecuta

Ciri dan struktur

Lendemeriella exsecuta is a crustose lichen, meaning it grows as a thin, crust-like layer tightly attached to its . The main body (thallus) appears grey, occasionally dark grey or off-white, and forms a continuous surface that may develop small cracks creating distinct segments called . These areoles measure 0.5–1 mm across and may appear slightly pinched at their base. The reproductive structures (apothecia) are small disc-like organs measuring 0.2–0.7 mm in diameter. These sit directly on the surface without a stalk and display considerable colour variation – from brownish-yellow to orange-brown, eventually becoming completely black. The are surrounded by a raised rim () that ranges from black to olive in colour and may eventually become less prominent as the disc becomes more convex. When viewed under a microscope, the internal structure reveals several distinct layers. The spore-producing layer (hymenium) is colourless and 65–90 micrometres (μm) tall, occasionally reaching 135 μm. It contains cylindrical spore sacs (asci), each producing eight two-celled spores. These transparent spores are ellipsoid in shape, measuring roughly 12–16.5 by 6–7.5 μm, with a distinctive thickened area at their centre. The lichen contains various chemical compounds, including several pigments that give it its characteristic appearance. When tested with common chemical spot tests, the thallus is K−, C−, and P−. However, the apothecia are K± (red). The lichen's chemistry includes several secondary metabolites such as parietin, emodin, and fragilin, along with a unique substance that remains unidentified.

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Rujukan: [1]

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Habitat dan peran ekologis

Lendemeriella exsecuta primarily inhabits Arctic and alpine environments, where it grows on silica-rich rocks that have a basic (non-acidic) chemistry. This lichen shows a preference for sheltered locations protected from strong winds, particularly in areas around and above the treeline where conditions are humid. While it is believed to have a circumpolar distribution – occurring in a band around the Earth's polar regions – it is particularly well-documented in the Alps mountain range of Europe. A single collection has been recorded from Bering Island (Russian Far East). In the Antarctic, it has been documented from the South Shetland Islands and the Antarctic Peninsula, where it often grows alongside Umbilicaria decussata and Usnea sphacelata. Placopsis antarctica is another typical associate.

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Rujukan: [1]

Habitat atau konteks temuan

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Substrat

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Peran atau konteks

Pembentuk liken

Reproduksi

The reproductive structures (apothecia) are small disc-like organs measuring 0.2–0.7 mm in diameter. These sit directly on the surface without a stalk and display considerable colour variation – from brownish-yellow to orange-brown, eventually becoming completely black. The are surrounded by a raised rim () that ranges from black to olive in colour and may eventually become less prominent as the disc becomes more convex. When viewed under a microscope, the internal structure reveals several distinct layers. The spore-producing layer (hymenium) is colourless and 65–90 micrometres (μm) tall, occasionally reaching 135 μm. It contains cylindrical spore sacs (asci), each producing eight two-celled spores.

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 Lendemeriella exsecuta dari Wikimedia Commons. The rock-dwelling crustose lichen Lendemeriella exsecuta . Identifikasi mengikuti record berkas sumber.

Jenis

Fotografi

Kredit

Pier Luigi Nimis

Lisensi

CC BY-SA 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] Lendemeriella exsecuta — Wikipedia (en)Bagian sumber: Frozen revision 1336327853
   Tanggal penghimpunan sumber: 2026-10-12
   Teks sumber: CC BY-SA4.0 · Wikipedia contributors
2. [2] Catalogue of Life Base2026-09-11 — Lendemeriella exsecutaBagian sumber: ColDP NameUsage.tsv ID B2PYP; accepted species; source 2073
   Tanggal penghimpunan sumber: 2026-10-12
3. [3] Dokumentasi visual — Lendemeriella exsecutaBagian sumber: Individual media record; identification follows the source, not independent determination
   Tanggal penghimpunan sumber: 2026-10-12
   Media sumber: CC BY-SA 4.0 · Pier Luigi Nimis