Preliminary assessment 2015
A: Intensive logging has been made and large portion of forests replaced oil palm plantation in the lowland rain forests of Malaysia. It is at least VU, decline of habitat > 30%, probably more, during the last 50 yrs (data needed).
This species was described as a member of Buglossoporus by E.J.H. Corner. However, his genus concept is already outdated, and Buglossoporus is probably not a proper genus to accommodate this species. This is most possibly a member of Fomitopsidaceae, and could be allied with Laetiporus, but detailed phylogenetic studies are desirable to reveal its phylogenetic position.
Buglossoporus magnus produces a very conspicuous sporocarp with a large and massive pileus up to 60 cm wide, and orange to pinkish coloration. E.J.H. Corner stayed in Singapore from 1929 to 1946, and made intensive collections in Singapore and other areas in Malaysia, but only a single specimen (holotype) was collected by him during his stay in Singapore despite its conspicuous and “slowly decaying (Corner 1984)” sporocarps. This suggests that it is a very rare, and possibly an infrequently fruiting species.
On and after the 1990s, mycological teams from ‘Forest Research Institute Malaysia (FRIM)’ and ‘Forestry and Forest Products Research Institute (FFPRI)’ made intensive collections of polypores in various areas in Malay Peninsular. During the expeditions, however, only 2 additional records were made from 2 localities.
All collections were made on large fallen logs in old growth forests in lowland areas of Malay Peninsula suggesting that this fungus is associated with old growth lowland rainforests.
Hitherto only 3 localities each with a single collection are known. All localities are situated in lowland areas of middle to southern parts of Malay Peninsular. Despite its conspicuous fruiting bodies, it has not been reported from the surrounding areas including Borneo, Java, Sumatra, and other Southeast Asian countries.
The holotype was collected in Bukit Timah, Singapore on 1940. This is a small forest reserve only with an area of 1.6 km2. Other records were made at Endau Rompin Forest Reserve (northern part of Johor) in 2009, and Pasoh Forest Reserve (Negeri Sembilan) in 2010. The former covers an area of 870 km2, and the latter 24.5 km2. Pasoh is a field research station of FRIM, and intensive collections had been made by FRIM and FFPRI researchers, but it is also known from a single collection from Pasoh. This suggests that this fungus should be a very rare species in the site.
Population trend is not clear, but old growth forests in lowland Malaysia has been seriously declined because of deforestation and oil palm plantations.
Population Trend: Uncertain
All specimens were produced on large fallen logs in old growth lowland rainforests in Malay Peninsular. It is associated with a brown rot. Host range is still unknown. It can be a saprophyte or a heart rot fungi of huge living trees, but few ecological information is available. Sporocarps are annual (but may persist for 1 or 2 months, because they are slowly decaying), but mycelia are possibly persist for long years in the huge substrates as in other huge log dwellers.
This fungus grows on large fallen logs. Huge trees can be decreased even by selective loggings, so loggings as well as deforestation in lowland areas of Malaysia are considered threats for this fungus.
Conservation of old growth lowland rain forests is the primary action. Many of the old growth forests in Malaysia are already reserved as national parks or other forest reserves. This fungus can be expected from matured forests with logging profiles, and loggings are to be restricted in these potential localities.
More intensive monitoring is desirable in Endau Rompin and other old growth lowland rain forests in Malay Peninsula and surrounding areas to reveal its exact distribution area. It is also desirable if this fungus shows specificity or preference for certain tree species.
Corner 1984. Ad Polyporaceas II, Polyporus, Mycobonia and Echinochaete; III, Piptoporus, Buglossoporus, Laetiporus, Meripilus and Bondarzewia. Beif. Nova Hedwig. 78:1-219.
Hattori, T; Ota, Y; Sotome, K; Lee, S.S. 2010. Possible endangered polypores from Peninsular Malaysian lowland. IMC9 The biology of fungi. Programme Book. P2.163.
Hattori, T; Yamashita, S; Lee, S.S. 2012. Diversity and conservation of wood-inhabiting polypores and other aphyllophoraceous fungi in Malaysia. Biodiversity and Conservation 21:2375–2396.