Giant oyster

What it is and what it was called

Pleurotus giganteus is a large mushroom found in the tropics. Its name has moved through the literature. It was once classed as Lentinus giganteus or Panus giganteus, and the sources reviewed say that its distinctive physical characters, together with molecular data, now place it in the genus Pleurotus. A reader who meets it under an older name in a book or a market list is looking at the same mushroom.

The species is widely known in the sources as a collected wild food. A 2012 study of new collections from Sri Lanka and Thailand reports that it is widely eaten in Sri Lanka. The same record names it as a popular edible mushroom in its range, and the 2012 paper reports that it was not yet grown commercially in either country.

Where it is eaten

The mushroom is collected and eaten in many tropical countries, Thailand among them, according to the Thai and Sri Lankan sources reviewed. Its use is documented as a wild food gathered in the wild, and the sources do not describe a traditional preparation method, so this page does not give one.

In China the mushroom is known by a local name, zhudugu, which the search summary translates as swine's stomach. The name is recorded here as a name only. The sources reviewed do not connect it to a documented food use, so no China place is claimed.

How it is grown

Cultivation was not established at the time of the 2012 study. That paper says that although the mushroom is popular, it was not cultivated commercially in Thailand or Sri Lanka, and it describes a two-step method: first inoculating a sawdust substrate in polypropylene bags, then transferring the colonised material to soil.

A 2018 review describes a sawdust-based substrate with a soil casing as the standard approach, and a 2023 Thai paper describes the species as domesticated in Thailand. The sources reviewed do not give temperatures, yields, timings or substrate ratios, so this page gives no figures. The cultivation method is a commercial and horticultural process, and a home method cannot be taken from this page.

What the record does not yet settle

The sources consulted give little on the early history of the mushroom in Thailand or Ceylon. A search of the Sri Lankan record found only a general 1986 book on oyster mushroom cultivation, not one about this species, so no historical claim is made here.

The sources do not describe the flavour, texture or cooking behaviour of the mushroom, and they do not give a storage life. This page makes no claim on any of them.

Safety wording: the sources reviewed describe the mushroom as a wild food in its range. They do not provide a safety assessment for picking it, and this page gives no identification or edibility verdict. A wild mushroom should be identified by an expert before it is eaten. Pleurotus giganteus is named here from the research record and should not be used to identify a specimen.