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Desmotheca (Orthotrichaceae) : Gondwanan fragmentation and the origin of a Southeast Asian genus
(1990)
Desmotheca Lindberg was proposed in 1872 as a replacement name for the illegitimate Cryptocarpon Dozy & Molk. (1844) and Cryptocarpus Dozy & Molk. (1846). Seven names have been placed in these genera, from which two species appear to be taxonomically valid. Desmotheca apiculata (Dozy & Molk.) Card. occurs from New Caledonia and New Guinea west to Indonesia and the Andaman Islands, north to Burma, Thailand, Vietnam and Mindanao in the Philippines, while D. brachiata (Hook. & Wils.) Vitt comb. nova is restricted to the island of Luzon in the Philippines. The evolution and dispersal of this genus can be related to the northward movement of Gondwanan island blocks during the Cretaceous.
Chromosome numbers with information on meiotic behaviour are recorded for the first time for the following taxa in the family Orthotrichaceae from Papua New Guinea - Desmotheca apiculata (Dozy & Molk.) Lindb. ex Card. n=6; Macromitrium incurvifolium (Hook. & Grev.) Schwaegr. n=9, M. longicaule C. Muell. n=6 (5+X/y), M. orthostichum Nees ex Schwaegr. n=7 (6+ X/y), M. salakanum C. Muell. n=9, M. similirete Bartr. n=9. M. streimannii Vitt n=9 (8+m); Schlotheimia emarginato-pilosa Herz. n=9 and S. macgregorii Broth. & Geh. n=11.