CR

Orthotrichum casasianum

StableCREUCREU

Overview

A detailed profile for this species is sourced from the IUCN Red List of Threatened Species as assessments become available.

Orthotrichum casasianum faces severe threats from habitat destruction due to urban development and infrastructure expansion in its limited Mediterranean range. The species is particularly vulnerable to air pollution and changes in microclimate conditions that affect the specific bark substrates it requires for growth. Climate change poses an additional threat through altered precipitation patterns and increased drought frequency, which can eliminate the humid conditions essential for this moss species' survival.

Threat summary

Habitat

Orthotrichum casasianum is an epiphytic moss species that grows exclusively on the bark of specific tree species in Mediterranean woodland and scrubland environments. It requires humid microclimates with stable moisture conditions, typically found in sheltered locations with consistent but indirect light exposure.

Wetlands (inland) - Permanent rivers/streams· major

Conservation measures underway

Species recovery

Other threatened species in ORTHOTRICHACEAE

VU

Orthotrichum dentatum

Stable
Orthotrichum handienseCR

Orthotrichum handiense

Declining
CR

Lewinskya lamyana

Unknown
EN

Ulota macrospora

Unknown

Threatened in Spain

VU

Lepiota echinella

Unknown
VU

Copper Shark

Carcharhinus brachyurus

Declining
EN

Lyophyllum deliberatum

Unknown
VU

Hemicycla invernicata

Stable

Frequently asked questions

Why is Orthotrichum casasianum classified as Critically Endangered?
Orthotrichum casasianum is classified as Critically Endangered — facing an extremely high risk of extinction in the wild — because population sizes are very small, declining sharply, or restricted to a tiny range. Orthotrichum casasianum faces severe threats from habitat destruction due to urban development and infrastructure expansion in its limited Mediterranean range. The species is particularly vulnerable to air pollution and changes in microclimate conditions that affect the specific bark substrates it requires for growth. Climate change poses an additional threat through altered precipitation patterns and increased drought frequency, which can eliminate the humid conditions essential for this moss species' survival.
Where does Orthotrichum casasianum live?
Orthotrichum casasianum occurs in Spain. Country-level distribution data is sourced from the IUCN Red List and cross-referenced with GBIF occurrences.
What are the main threats to Orthotrichum casasianum?
The main threats to Orthotrichum casasianum are 1.1, 11.1, 2.1, and 6.1. The full IUCN-classified threat record for this species is detailed on the species page.

Get weekly conservation intelligence

One short digest a week of the most striking species and country data we ship, plus breaking conservation news paired with our database where it matters.

Free, no spam. One-click unsubscribe in every email.