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Species Richness and Conservation Status of Ferns and Lycophytes in Mt . Hamiguitan Range Wildlife Santuary , Davao Oriental , Philippines

The diversity of Philippines vascular plants includes an estimated 1,100 species of ferns and lycophytes distributed among 154 genera and 34 families, according to recent classifications (e.g. Smith et al. 2006). This estimate continues to increase because of new species discoveries and new records in the Philippines (Amoroso et al. 2009; Barcelona et al. 2013). Mt. Hamiguitan Range Wildlife Sanctuary, located in Davao Oriental Province, Mindanao, is a protected area covering 6,834 ha between 6 °40 'N to 6 °47 'N and 126 °09 'E to 126 °13 'E with the highest elevation of 1,637 m a.s.l. (Karger et al. 2012). It is characterized by a variety of vegetation types including a unique mossy pygmy forest (Amoroso et al. 2009; Figure 1). It was designated as a World Heritage Site in June of 2014 and is also a Mindanao Long Term Ecological Research Site. For the latter, extensive data collection has provided baseline information on the floral and faunal diversity in the area (Amoroso & Aspiras 2011; Amoroso et al. 2009, 2011). Nonetheless, there is no published checklist of ferns and lycophytes for the sanctuary. Here, such checklist is provided, along with a species conservation assessment of ferns and lycophytes in the sanctuary. An updated species list and conservation assessment of ferns and lycophytes in Mt. Hamiguitan Range Wildlife Sanctuary, Davao Oriental were provided on the basis of recent field survey and examination of herbarium specimens. One hundred and fifty-two species, belonging to 27 families and 72 genera, were recorded. The species figure is about 13% of the total number of fern and lycophyte species in the Philippines and nearly 20% of the total number on Mindanao Island. Twelve species are broadly distributed Philippine endemics and three more are found only on Mindanao. Nine species are new records for Mindanao. A site-endemic species, Lindsaea hamiguitanensis, was also documented. Of the 18 threatened species recorded, one is critically endangered, seven are endangered, and 10 are vulnerable.