Bulbophyllum coriophorium, is an epiphytic orchid, is known from Comoros and Madagascar, in humid and subhumid forests, between 10 and 1,700 m elevation.

The species is known from 105 collections made between 1887 (Le Myre de Viliers s.n.) and 2021 (Antananarivo Spirit collection 845T995). The 105 collections represent 99 occurrences. Fifteen (15) occurrences of B. coriophorum are located outside protected area and are threatened by forest clearing due to shifting agriculture and forest degradation due to small scale agriculture, along with wood harvesting for subsistence and wildfires. Other 55 occurrences, even if present in 20 protected areas, are threatened by illegal logging. In addition to these officially protected sites, 21 occurrences have been made in the footprint of a mining project undergoing intense human pressure such as forests clearing. These occurrences must be considered as extirpated. Moreover, two occurrences (Decary 18541 and Sieder 86) are facing forest clearing due to shifting agriculture, wildfires and forest degradation due to small scale agriculture, along with wood harvesting for subsistence, and should be also considered as extirpated. The last eight occurrences have been made in the Conservation Zone surrounding the footprint of the mining project, which should be subjected to protection in the near future. The species is thus known from 105 collections representing 76 existing and 23 extirpated occurrences.

The extent of occurrence (EOO) of B. coriophorum is estimated to be 558,224 km² (far exceeding the limits for Vulnerable status under criterion B1) whereas its area of occupancy (AOO) is estimated at 284 km² (which falls within the limits for Endangered status under criterion B2). The loss of the occurrences in the footprint of a mining has induced a continuous decline in the AOO, the number of subpopulations and mature individuals. With regard to the most serious plausible threat of forest clearing and illegal logging, the 76 existing occurrences of the species represent 26 locations (sensu IUCN 2022), far exceeding the upper threshold for "Vulnerable" status under criterion B. B. coriophorum is not severely fragmented and does not meet the threshold of any threatened categories criterion B. Twenty three occurrences of the species are considered as extirpated due to the threat of a mining project (12% of the total) based on a reduction of the AOO, which cannot lead to consider the species under a threatened category according to criterion A. Therefore, B. coriophorum is assessed as Least Concern (LC).  

Bulbophyllum coriophorum, an epiphytic orchid, is known from Comoros (Ndzouani, Bahani, (Mwali), Mayotte (Combani) and Madagascar in 11 Regions: Alaotra-Mangoro and Analanjirofo (formerly Province of Toamasina); Analamanga (formerly Province of Antananarivo); Amoron'i Mania, Atsimo-Atsinanana, Fitovinany, Ihorombe, and Matsiatra Ambony (formerly Province of Fianarantsoa); Diana and Sava (formerly Province of Antsiranana); and Anosy (formerly Province of Toliara); in humid and subhumid forests (Madagascar Catalogue 2022).

The population of Bulbophyllum coriophorum is currently thought to be decreasing since its habitat is threatened by forest clearing due to mining activities, forest degradation by illegal logging, wildfires, timber harvesting for small-scale subsistence, and slash-and-burn agricultural practices (tavy). The number of individuals of B. coriophorum is not known and cannot be estimated since the species is an epiphyte on trunks and branches in humid, subhumid forests, and mossy shrublands.

Bulbophyllum coriophorum is an epiphytic herb growing on the trunk and branches of trees on moss- and lichen-covering trees in humid and subhumid forests, and mossy shrubland highland between 10 and 1,700 m elevation (Madagascar Catalogue 2022).

Fifteen occurrences of Bulbophyllum coriophorum are located outside protected area and are threatened by forest clearing due to shifting agriculture and forest degradation due to small scale agriculture, along with wood harvesting for subsistence and wildfires. Other 55 occurrences, even if present in protected areas, are threatened by illegal logging. In addition to these officially protected sites, 21 occurrences have been made in the footprint of a mining project undergoing intense human pressure such as forests clearing. These occurrences must be considered as extirpated. Moreover, two  occurrences (Decary 18541 and Sieder 86) are facing forest clearing due to shifting agriculture, wildfires and forest degradation due to small scale agriculture, along with wood harvesting for subsistence, and should be also considered as extirpated. The last eight occurrences have been made in the Conservation Zone surrounding the footprint of the mining project, which should be subjected to protection in the near future. It is inferred that ongoing loss of its habitat will induce a continuing decline in AOO, habitat extent and quality, and the number of subpopulations and mature individuals.

There are no reported uses of the species, although it may be sought by specialist collectors.

Bulbophyllum coriophorum, an epiphytic orchid, is known from 20 protected areas in Madagascar: Analamazaotra National Park, Andohahela National Park, Anjozorobe-Angavo Protected Harmonious Landscape, Befotaka-Midongy du Sud National Park, Corridor Ankeniheny-Zahamena Natural Resources Reserve, Corridor Forestier Ambositra-Vondrozo Protected Harmonious Landscape, Corridor Marojejy-Anjanaharibe South-Tsaratanàna - Northern Part Natural Resources Reserve, Loky-Manambato Protected Harmonious Landscape, Makira Natural Park, Mangabe-Ranomena-Sahasarotra Natural Resources Reserve, Manongarivo Special Reserve, Mantadia National Park, Marojejy National Park, Masoala National Park, Montagne d'Ambre National Park, Ranomafana National Park, Torotorofotsy Protected Area, Tsaratanàna Strict Nature Reserve, Tsitongambarika Natural Resources Reserve, and Zahamena National Park. The species is also currently placed on Appendix II of the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES). Ex situ conservation is recommended (micro-propagation, seed banking, and living collections).