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A revision is made of the lichen family Parmeliaceae in Dominica, based on previous published records by Elliott and on collections by the author. Twenty-two species are now known for Parmelia, the only genus in this family on the island. A new species, Parmelia mordenii, is described from rock habitats in the dry scrub woodland.
The 47 species of Parmelina are revised on the world level. Two sections are recognized: section Parmelina with 30 species widely distributed in temperate to tropical montane regions and section Myelochroa with 17 terpene-containing species concentrated in eastern and southern Asia. The genus is most closely related to Parmotrema Massalongo. Five new species, P. crassata Hale, P. degelii Hale, P. indica Hale, P. rhytidodes Hale, and P. schindleri Hale, are described, and six new combinations proposed, P. amagiensis (Asahina) Hale, P. damaziana (Zahlbruckner) Hale, P. endoleuca (Taylor) Hale, P. irrugans (Nylander) Hale, P. jamesii (Hale) Hale, and P. pastillifera (Harmand) Hale. New combinations are also made for Hypotrachyna baguioensis (Hale) Hale and Parmotrema nylanderi (Lynge) Hale.
The genus Boerhavia is discussed, its infrageneric classification is reviewed, and four sub-genera are recognized. Distinctions of two Linnaean species, B. diffusa and B. repens are clarified. Boerhavia mutabilis R. Brown and B. pubescens R. Brown are typified. The Boerhavia repens group is discussed and delimited, as is B. rubicunda and several similar species. Boerhavia repens var. maris-indici, B. albiflora, B. crispifolia, and B. herbstii are described as new. A curious abnormal form of B. crispifolia is also described and discussed.