Milky mushroom

One mushroom, two scientific names

Milky mushroom is the common cultivation and food name for a tropical white agaric historically published as Calocybe indica. Purkayastha and Chandra described that name in 1974; the type record is a University of Calcutta collection from West Bengal dated 20 July 1972. A recent phylogenetic study proposed the combination Macrocybe indica after examining Pakistani material with morphology and ITS sequence evidence. Species Fungorum now shows Macrocybe indica as the current name, while NCBI and much of the cultivation literature still use Calocybe indica. Retaining both names makes the research trail searchable without pretending every database has already adopted the change.

Milky mushroom and the Bengali name Dudhi chatta are useful food names, but common names are not unique taxonomic identifiers. The milky label can be used in cultivation and trade more broadly than a single scientific species. In this account the formal names refer to the taxon tied to the West Bengal type, with the recent Macrocybe treatment and older Calocybe literature kept visible.

From a regional mushroom to a crop

Wild milky mushrooms were gathered in West Bengal and sold in Calcutta markets before the crop became a standard cultivated mushroom. In local-language usage, Dudhi chatta evokes its white, milky appearance. The crop is now associated with warm-climate agriculture because it can fruit in conditions that are unsuitable or costly for cool-climate button mushrooms. Indian research stations, agricultural universities and small growers developed spawn and cultivation methods using crop residues, turning a seasonal wild food into a controllable crop.

A notable cultivar milestone was APK2, released by Tamil Nadu Agricultural University in Coimbatore in 1998. Later research has tested selected strains at multiple locations and used different cereal and agro-industrial wastes. Each trial is tied to its inoculum, substrate, casing and local climate; a yield from one study is not a promise for another farm.

A fleshy white agaric

Cultivated fruit bodies are robust and fleshy. Young caps are convex and become flatter with age; the cap and thick stipe are white, and the gills remain pale. A farinaceous or flour-like odour is described in taxonomic and cultivation reviews. Mature fruit bodies can be large, but size varies with strain and growing conditions. The clean white form, firm texture and relatively slow visible browning help the crop travel and appeal to consumers.

The 2026 taxonomic paper links the new generic placement to phylogenetic analysis, but the original type is not reported as sequenced in the abstract. Old cultivation photographs and named strains are therefore best read in the historical Calocybe literature, with the accepted-name update attached rather than silently rewriting each culture record.

Growing on agricultural residues

The fungus grows saprotrophically on organic material, and cultivation research uses lignocellulosic plant residues as the main substrate. Paddy or rice straw is a common base; wheat straw, horse-gram waste, maize straw, sugarcane bagasse and leaves, bamboo leaves, grasses and coir have also been tested. The mycelium's ability to colonise plant-fibre materials makes use of residues that would otherwise have lower value.

Experiments do not give one universal best substrate. In the Bangladesh study, coconut coir supported the highest measured mycelial growth, while rice straw produced the largest biological and economic yield among the tested materials. In the Konkan trial, paddy straw performed best among its test set, including horse-gram waste, bamboo leaves and grass. These outcomes reflect different strains, substrate preparation, room conditions and experiment design, so they are comparisons within trials rather than transferable production guarantees.

Casing is a separate layer placed over a colonised substrate. It gives developing pins a moist, supportive surface and encourages uniform fruiting. Studies have evaluated soil and sand mixtures, cow dung, farmyard manure, vermicompost, and spent mushroom substrate. In one Bangladesh experiment, cow dung mixed with loamy soil at a tested depth performed well; in the Konkan trial, vermicompost and a mixture containing dried spent biogas slurry produced high efficiencies. Those recipes are experimental conditions, not a single required casing formula.

Warm conditions and the crop calendar

Milky mushroom production is suited to hot, humid settings. Indian institution and field reports commonly place cropping temperatures near 30–35°C, although reviews and experimental studies use other ranges and humidity settings. Spawn run and fruiting are separate stages and can have different environmental conditions. The IIHR cultivation poster describes substrate preparation, heat treatment, spawning, spawn running, casing and cropping as distinct operations; a number reported for one stage should not be copied into another.

Wild fruiting is a different calendar from a controlled crop. A review reports May to August collections in the plains of India, typically after showers following a dry spell, with regional records in West Bengal, Tamil Nadu and Rajasthan. In the Gangetic plain of Bangladesh and West Bengal, summer is also reported as a wild fruiting period. Cultivated bags can be produced under controlled conditions when warm-weather infrastructure is available, so those monsoon-associated collection dates are not a universal farm schedule.

Food uses and what the evidence means

The species has a long food history in West Bengal, where wild mushrooms were collected and sold, and has since become a cultivated crop for household and commercial consumption. Cultivated milky mushrooms are grown in India and warm-climate production systems beyond it. The available sources support the broad food use of identified milky mushroom, but do not establish a single traditional recipe, preparation method or serving size. This record therefore describes it as an edible ingredient without inventing a dish or a cooking instruction.

Studies of nutrient composition and extracts have measured protein, fibre, phenolic compounds and other constituents. These figures vary with substrate, strain, moisture and analytical method. Laboratory antioxidant assays or cell studies do not show that eating the mushroom prevents disease or treats a medical condition; the food evidence and extract research should stay separate.

Locations and identity limits

West Bengal supplies the type locality, regional gathering history and Calcutta market context. Other reported wild occurrence regions include the plains of Tamil Nadu and Rajasthan. Dapoli in Maharashtra and Savar in Bangladesh are research and cultivation contexts, not additions to a wild native range. A voucher-backed 2020 collection from Phu Luong, Phu Vang, Vietnam provides a more recent locality record, while the Pakistan paper supplies the recent taxonomic reassignment. Map coordinates attached to some named cities are municipal or campus display points, never collection GPS where a source gives no coordinates.

White mushrooms can be difficult to distinguish from unrelated agarics. This page describes a cultivated species and does not identify wild specimens. The edible use records belong to correctly named, cultivated or documented material; colour or an online photo match is not enough to establish that an unknown mushroom is this species.