# Schizophyllum commune

Schizophyllum commune is a species of fungus in the genus Schizophyllum. The mushroom resembles undulating waves of tightly packed corals or a loose Chinese fan. Gillies or split-gills vary from creamy yellow to pale white in colour. The cap is small, 1–4 centimetres (3⁄8–1+5⁄8 in) wide with a dense yet spongey body texture. It is known as the split-gill mushroom because of the unique, longitudinally divided nature of the namesake gills on the underside of the cap.
It is found on rotting wood throughout the world. It may be a pathogen and is classified as inedible, although it has been regionally consumed.

## Etymology

Schizophyllum is derived from [the Greek] Schíza meaning split because of the appearance of radial, centrally split, gill like folds; commune means common or shared ownership or ubiquitous.

## Description

Schizophyllum commune is usually described as a morphological species of global distribution, but some research has suggested that it may be a species complex encompassing several cryptic species of more narrow distribution, as typical of many mushroom-forming Basidiomycota.
The caps are 1–4 centimetres (3⁄8–1+5⁄8 in) wide with white or grayish hairs. They grow in shelf-like arrangements, without stalks. The gills, which produce basidiospores on their surface, split when the mushroom dries out, earning this mushroom the common name split gill. The mushrooms can remain dry for decades and then be revived with moisture. The spore print is white.

### Mating

It has a tetrapolar mating system with each cell containing two mating-type loci (called A and B) that govern different aspects the mating process, leading to 4 possible phenotypes after cell fusion. Each locus codes for a mating type sublocus (α or β) and each type is multi-allelic: the A locus has 9 alleles for the α type and an estimated 32 for its β type, and the B locus has 9 alleles each for both its α and β types. When combined this gives an estimated $9\times 32\times 9\times 9=23328$ potential mating type specificities. This does not mean all different mating types are compatible with one another, because compatibility between haploid individuals exists only when for both the A and the B mating-type locus at least the α or β are different. Strains are thus compatible with $(1-{\frac {1}{(9\times 32)}})\times (1-{\frac {1}{(9\times 9)}})=0.984$ of the population.
While all mating types can initially fuse with any other mating type, a fertile fruit body and subsequent spores will result only if both the A and B loci of the merging cells are compatible. If neither the A nor B are compatible the result is normal monokarytic mycelium, and if only one of A or B are compatible, the result is either two mycelia growing in opposite directions (only A compatible) or a "flat" phenotype with no mycelia (only B compatible).

### Genetics

The genome of Schizophyllum commune was sequenced in 2010.

## Habitat and distribution

It is common in rotting wood. It can be found throughout the world, year-round in places such as North America.

## As a pathogen

It may be a common cause of fungal infections and related diseases, most commonly that of the lungs. They have also been reported to cause sinusitis and allergic reactions.

## Uses

Hydrophobin was first isolated from S. commune.

### Edibility

The species was regarded as nonpoisonous by Orson K. Miller Jr. and Hope H. Miller, who considered it to be inedible due to its smallness and toughness. Because the mushrooms absorb moisture, they can expand during digestion. However, some sources indicate that it contains antitumor and antiviral components.
As of 2006, it was widely consumed in Mexico and elsewhere in the tropics. The preference for tough, rubbery mushrooms in the tropics was explained as a consequence of the fact that tender, fleshy mushrooms quickly rot in the hot humid conditions there, making their marketing problematic.
In Northeast India, in the state Manipur, it is known as kanglayen and one of the favourite ingredients for Manipuri-style pancakes called paaknam. In Mizoram, the local name is pasi (pa means mushroom, si means tiny) and it is one of the highest rated edible mushrooms among the Mizo community.

## Gallery

* Schizophyllum commune in the Santa Cruz Mountains of California
* Schizophyllum commune Elk Grove, Illinois
* Schizophyllum commune in Missouri, US
* Schizophyllum commune Grand Rapids, Michigan
* Schizophyllum commune in Estonia