Red List of liverworts and hornworts for Réunion (Mascarene archipelago) Author Ah-Peng, Claudine Author Bardat, Jacques Author Pócs, Tamás Author Söderström, Lars Author Staménoff, Pierre UMR PVBMT, Université de La Réunion, 15 Avenue René Cassin, 97715 Messag Cedex 9, France Author Strasberg, Dominique UMR PVBMT, Université de La Réunion, 15 Avenue René Cassin, 97715 Messag Cedex 9, France text Phytotaxa 2012 2012-10-05 68 1 1 23 http://biotaxa.org/Phytotaxa/article/view/phytotaxa.68.1.1 journal article 10.11646/phytotaxa.68.1.1 1179-3163 5066080 30. Microlejeunea strasbergii Ah-Peng & Bardat (2011: 669) Family:— Lejeuneaceae . Distribution:— Endemic. Habitat:— Microlejeunea strasbergii appears to be restricted to the Piton des Neiges volcano slopes, in montane and sub-alpine levels of the mesotherm forest (forest of Acacia heterophylla Willd. ) and to the high ericoid formations (bushes of Philippia sp. or Sophora sp. ). Ecologically, it seems that M. strasbergii is a specialist of corticolous habitats, growing over other bryophytes or directly on tree bark. Threat:— Small and restricted populations with a narrow altitudinal range ( 1750–2350 m ), maybe sensitive to global warming. IUCN threat category:— VU[D2] Specimens:— Known from 5 localities, Commune de Saint-Benoît, GR du Piton des Neiges, epiphyllous on corticolous bryophytes, 29 March 2008 , 21°05'17’’S , 55°30'16’’E , Ah-Peng, Bardat, Chuah-Petiot & Hedderson 1950P2Q2TC2 , ( holotype : REU; isotypes: PC); Takamaka trail, eastern slope of Piton des Neiges, corticolous between 0–50 cm , 21°05’51 S , 55°35’19 E , 28 March 2008 , 1150 m, Ah-Peng et al. 1150P2Q3TA1 ; GR Piton des Neiges trail, corticolous between 0–50 cm , 21°04’42 S , 55°31’42 E , 29 March 2008 , 1750 m, Ah-Peng et al. 1750P2Q3TA2 ; idem, corticolous between 50 cm – 1 m , Ah-Peng et al. 1750P2Q3TB2 ; idem corticolous between 1–2 m , 21°05’17 S , 55°30’16 E , 29.03.2008 , 1950 m, Ah-Peng et al. 1950P1Q3TC3 ; idem corticolous between 50 cm – 1 m , 21°05’15 S , 55°31’20 E , 1950 m , Ah-Peng et al. 1950P2Q1TB3 ; idem corticolous between 50 cm – 1 m , 21°05’39 S , 55°30’57 E , 2150 m , Ah-Peng et al. 2150P2Q1TB3 ; idem corticolous between 0–50 cm , 21°05’56 S , 55°30’23 E , 2350 m , Ah-Peng et al. 2350P1Q2TA3 .