The identity of the enigmatic Thibaudia ardisiifolia (Ericaceae: Vaccinieae) is clarified. It is shown that a mixed gathering consisting of leaves of Clusia ducuoides (Clusiaceae) and flowers of a Thibaudia species served as basis for Kunth when he validated this name. A lectotype in the Willdenow Herbarium is designated, and the correct name, T. floribunda Kunth, is applied to this taxon for the first time. A list of synonyms and a full description of this species, which is native in Venezuela, Colombia, Ecuador, Peru and Bolivia, are also provided together with ecological data. Additionally, Cuatrecasas's incorrect interpretation of the unpublished name T. arbutifolia and the confusion it caused are discussed, and the correct name Macleania rupestris (Ericaceae: Vaccinieae) is applied. Citation: Luteyn J. L. & Lack H. W. 2026: Thibaudia ardisiifolia (Ericaceae: Vaccinieae): an enigma solved and a new synonymy provided for T. floribunda. – Willdenowia 56: 419–426 Version of record first published online on 4 September 2026.
The type material of Inga filicina Willd., the basionym of Parkia filicina (Willd.) Benth. ex Walp. (Leguminosae: Caesalpinioideae: Mimoseae) was collected by Friedrich Wilhelm Sieber from an unknown locality in Pará, Brazil for the German naturalist Johann Centurius Count von Hoffmannsegg in the first decade of the 19th century. Sieber spent several years in Brazil collecting natural history specimens for Hoffmannsegg although details about him and his travels are incomplete. A summary of the botanical and zoological achievements of both men is given. The material of I. filicina preserved in the Willdenow Herbarium at B comprises three separate elements: several bipinnate leaves, a peduncle with a bare capitular receptacle attached, and a group of detached flowers with long staminodial filaments. So far, P. filicina has not been equated with any other species in this genus, perhaps because the fertile parts indicate only the species group within P. sect. Parkia to which they belong, the leaves are possibly from a juvenile plant, and some leaflets are misshapen. Although the leaves share many characters with those of P. discolor Spruce ex Benth., a tree from black-water flooded forest (igapó) in Amazonia, which Sieber could have encountered in Pará, the detached peduncle would be exceptionally long for this species and it appears unlikely that Sieber s.n. is a mixed gathering. We suggest that P. filicina should be treated as a doubtful species because the type material is insufficient to establish its clear identity. Citation: Hopkins H. C. F. & Hopkins M. J. G. 2026: Notes on the identity of Parkia filicina (Leguminosae) from Pará, Brazil, its collector Friedrich Wilhelm Sieber and his patron Count von Hoffmannsegg. – Willdenowia 56: 299–311. Version of record first published online on 30 June 2026.
Anthurium malyi and A. radicans (Araceae) are morphologically similar and phylogenetically related species endemic to the Brazilian Atlantic forest in Bahia and Espirito Santo states. Both were originally described in the mid-nineteenth century from single cultivated collections, but paucity of field knowledge and loss of original specimens later led to doubt concerning their delimitation. Based on new and recent field collections, the present study establishes for the first time that the two taxa have different geographical ranges, introduces anatomical observations to supplement morphological comparisons and concludes that they are distinct taxonomic species. The review provides revised species descriptions, a summary of diagnostic characters, illustrations, commentary on ecology and geography, and anatomical comparison of leaf venation, petiole and spathe. Conservation status analysis estimated A. malyi as Endangered and A. radicans as Critically Endangered. Typifications are presented for A. malyi (lectotype) and A. radicans (neotype) following an investigation of the history of the original publications and materials. The significance of H. W. Schott's Icones Aroideae drawing collection at the Vienna Natural History Museum for typification and species delimitation is discussed in the context of his working methods.
A nomenclatural and taxonomic survey of some taxa of the genus Thymus for the Euro+Med PlantBase project is presented. The name at new rank T. striatus subsp. interruptus is proposed. Twenty-six names are typified: T. acicularis f. velebiticus, T. adamovicii, T. alpicola, T. atticus, T. boeoticus, T. boissieri var. muscoides, T. boissieri var. viridis, T. bracteosus, T. bracteosus f. neglectus, T. comosus, T. fontanesii, T. hirtus var. wallii, T. latifolius, T. leucostachys, T. monardii, T. montanus var. leucanthus, T. pseudoatticus var. nestiacus, T. pseudoatticus var. stachyoides, T. serpyllum f. angustissimus, T. serpyllum f. arenicola, T. serpyllum f. conglomeratus, T. serpyllum f. lengyelii, T. serpyllum f. litoralis, T. serpyllum f. rablensis, T. striatus var. lovcenicus and T. tymphrestus. The name T. monardii is selected here as the correct name for the illegitimate T. pallescens de No & eacute;, non Ten. Furthermore, a distribution update for T. leucotrichus subsp. leucotrichus is provided.
In the course of a revision of the historical lichen collections of Alexander Lindig from Colombia, housed in the herbaria PC, BM, G, H, M and S, we came across various specimens fitting the broad concept of Pyrenula andina Aptroot and P. masto phoroides (Nyl.) Zahlbr., including the type material. In order to clarify taxon concepts in this complex, we proceeded to revise numerous collections reported as P. andina and P. mastophoroides from the neotropics (Costa Rica, Puerto Rico, Colombia, Ecuador, Bolivia), plus one from the eastern palaeotropics (Papua New Guinea), which are almost all housed in the Herbarium Berolinense (B), with some duplicates in the ABL, COL and CR herbaria (including former INBio collections). Much to our surprise, the studied material revealed a total of 17 species, differing in the absence or presence of lichexanthone and in its location (on the thallus surface or in the medulla), the absence or presence of hamathecium inspersion and its extension (entire hamathecium or parts of it), ascospore type and size, and overall thallus and perithecial morphology. As a result, only the type collections of P. andina (from Costa Rica) and P. mastophoroides (from Colombia) represent these species in a strict sense. All other collections are either misidentifications or represent new species or taxa resurrected from synonymy. Misidentifications include P. adacta F & eacute;e, P. derma todes (Borrer) Schaer., P. diamantinensis C. O. Mendon & ccedil;a, Aptroot & M. C & aacute;ceres (new for Costa Rica), P. flavoinspersa Aptroot & Sipman, P. gahavisukana Aptroot (new for Costa Rica, Colombia and Ecuador) and P. quassiicola F & eacute;e. Pyrenula mastophoroides var. flavicans (Nyl.) Zahlbr. is removed from synonymy of P. mastophoroides and reinstated as P. flavicans (Nyl.) B. Moncada & L & uuml;cking comb. & stat. nov. The following eight species are described as new: P. endoperidermica B. Moncada & L & uuml;cking sp. nov. (Costa Rica), P. ferruginea B. Moncada & L & uuml;cking sp. nov. (Costa Rica), P. flavascolea B. Moncada & L & uuml;cking sp. nov. (Ecuador), P. henrici B. Moncada & L & uuml;cking sp. nov. (Papua New Guinea), P. inversa B. Moncada & L & uuml;cking sp. nov. (Colombia), P. latens B. Moncada & L & uuml;cking sp. nov. (Costa Rica, Colombia), P. tica B. Moncada & L & uuml;cking sp. nov. (Costa Rica) and P. xanthomacu lata B. Moncada & L & uuml;cking sp. nov. (Costa Rica, Colombia).
