Ophioderma subsessile (Ophioglossaceae), a New Snake Tongue Fern Species from Mindanao, Philippines.

A new species of Ophioderma, O. subsessile, is described from Mindanao, Philippines. This species is characterized by its mostly longer trophophore than sporophore, sporophore peduncle subsessile with a distinct sterile appendage, and strobilus longer than the peduncle. A description, illustrations, and key to the species of Philippine Ophioderma are provided. [ABSTRACT FROM AUTHOR]