Aptroot, A. 2014: [Abstract:] A Trypetheliaceae for every day. - In: : Livro de Resumos do Sétimo Encontro do Grupo Brasileiro de Liquenólogos. 1. Grupo Brasileiro de Liquenólogos pp. 25. [RLL List # 248 / Rec.# 39006] Abstract: Trypetheliaceae are a tropical lichen family. When they were first discovered in the early 19th century they were quite popular, and both Acharius and Fée published a monograph about them. At that time, only about a dozen species was known. At the turn of that century, 134 species were known. Most were however only known from one type specimen, and there were more species names than actual specimens, as many had been moved to other genera repeatedly. In the 20th century, little work was done on the family, with about 10 papers describing additional species (compared to over 100 in Parmeliaceae for instance). The generic division was changed considerably again, but in a very schematic way, so that often single specimens are attributeable to two different genera, which makes of course no sense. A revision of the family is under way, and by now 365 species are known. This includes 81 new species, which are mostly from equatorial South America (27 alone form Rondônia and an almost similar number from Venezuela and Guyana). Hamathecium inspersion and presence/absence of lichexanthone seem to be species characters. Together with a new, phylogenetically sound generic division of the family into genera, and the re-introduction of several old names, this will mean that almost all commonly used names will have to change. The family is by far the most speciose in equatorial South America. The genus Polymeridium is a characteristic genus of the semi-arid region in the North-East of Brazil.
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