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蘭撒(學名:Lansium domesticum;馬來語:langsat)又譯作冷剎、蘆菇或杜古(馬來語:duku)、龍貢或龍宮果。台灣稱為蘭撒果,香港稱為蘆菇,俗稱「泰國黃皮」但與黃皮不同科。由於蘭撒果實空隙中會有蠍子藏匿,所以進食時應格外小心,建議拿著蘭撒的莖部,放進水內大力搖晃,再摘下個別蘭撒。
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What Hong Kong calls “蘆菇” (lo4 gu1) is not only Duku or only Langsat.
It is the local name for the whole fruit group langsat / duku, scientific name Lansium domesticum (also Lansium parasiticum), family Meliaceae. Duku and Langsat are the two main types within that species. Wikipedia notes that Taiwan calls it 蘭撒, while Hong Kong calls it 蘆菇, also sold as “Thai wampee” or “dragon-palace fruit.” It is not related to mushrooms, and it is not the same family as Chinese wampee.
The dense, thin-skinned clusters most often seen in Hong Kong markets are closer to Langsat or Longkong.
The larger, rounder, thicker-skinned fruit is closer to Duku.

| Name | What it means |
|---|---|
| Hong Kong “蘆菇” | Umbrella name for the species |
| Langsat | Thinner skin, smaller and more oval fruit, longer clusters, sticky white latex, juicier, sweet-sour |
| Duku | Thicker skin, larger and rounder fruit, shorter clusters, little latex when ripe, thicker flesh, usually sweeter |
| Longkong (Thai longkong) | A natural intermediate type; very common in Hong Kong imports |
So: 蘆菇 = the fruit species. Duku and Langsat = two cultivars/types. A bag labelled 蘆菇 in a Hong Kong shop is often Langsat or Thai Longkong, not necessarily thick-skinned Indonesian Duku.
Langsat
Duku
Longkong / duku-langsat sits between the two: 15–25 fruits per bunch, round to oblong, medium skin, sweet, few seeds. This is the type Thailand exports most, and the type Hong Kong often sells as 龍宮果 or 泰國黃皮.
Some plant lists gloss Chinese 芦菇 as “Duku,” but everyday Hong Kong usage covers the whole group and does not split the two types at the stall.
Wash the whole bunch in water and shake it before picking fruit off, because scorpions sometimes hide in the gaps. Do not bite the seed; it is intensely bitter.
If your current 蘆菇 came in a long cluster with thin, slightly sticky skin, treat it as Langsat / Longkong, not classic thick-skinned Duku.