Studi sulle Homalomeneae (Araceae) del Borneo XI: Homalomena matangae, nuova specie del Sarawak, Borneo MalesianoViene descritta ed illustrata la nuova specie Homalomena matangae Y.C. Hoe, S.Y. Wong & P.C. Boyce, endemica del massiccio quarzifero del Matang, provincia Kuching, nord-ovest del Sarawak, Borneo malesiano, regione in cui Odoardo Beccari la raccolse per la prima volta durante la sua ascesa del Matang.

Homalomena debilicrista Y.C.Hoe is described and illustrated as a species new to science from the Matang massif sandstone formation, Kuching Division, NW Sarawak, Malaysian Borneo. It repre sents the sixth species of the informal Hanneae Complex, a morphotaxon apparently endemic to Bor neo and composed wholly of nomenclaturally novel species. Inflorescence events, notably spathe movement mechanisms, and interactions with insect visitors were observed and recorded to determine pollinator/s as part of an ongoing programme accumulating data on pollinator guild niche partition ing in Homalomena. Six insect taxa visited the inflorescences during anthesis: (1) ColeopteraChrysomelidae (Chaloenus schawalleri), Scarabaeidae: Rutelinae (Parastasia bimaculata), Nitidu lidae (genus undetermined), and Staphylinidae (genus undetermined) and (2) Diptera, two species of Colocasiomyia (Drosophilidae). Empirical data strongly implicate P. bimaculata and possibly C. schawalleri to be the pollinators of Homalomena debilicrista. A key to the sofar described species of the Homalomena Hanneae Complex is presented, and the new species is illustrated.

Three new colonial species of Schismatoglottis Calyptrata clade are described from Peninsular Malaysia and compared with the four already known morphologically similar species described from there. All seven species are illustrated from living plants and an identification key is provided.