Three new compounds, 2,4,4'-trihydroxydihydrochalcone (1), 3-(4-hydroxybenzyl)-5,7-dimethoxychroman (2), and 7-hydroxy-3-(4-hydroxybenzyl)chromone (3), were isolated from the resin "Dragon's blood" obtained from Dracaena draco along with 18 known compounds. The structures of 1, 2, and 3 were determined using MS and NMR techniques.

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Thelomma includes crustaceous species occurring on lignum and rocks. In a revision of the genus (Tibell 1976) seven species were included, three of them occurring only on the west coast of North America. Most of the species occur in areas with a mediterranean climate. One species, T. mammosum (Hepp) Massal., is known to have a remarkable distribution, occurring both along the North American west coast and in Macronesia and Portugal. Karnefelt (1980) discussed five additional species (Alectoria imshaugii Brodo & D. Hawskw., Cetraria merillii Du Rietz, Dimelaena radiata (Tuck.) Hale & Culb., Parmelia pustulosa Essl., P. subolivacea Nyl.) with a similar disjunct pattern of distribution. It was thus not altogether surprising to find another Thelomma species on Tenerife, viz. T. californicum (Tuck.) Tibell (Fig. 1), that hitherto has been known from a very restricted area in California only. The material from Tenerife agrees very well with Californian material in general morphology, anatomy and spore structure. The one very spectacular difference is that the thallus has a slightly yellowish hue and the medulla is deep ochraceous yellow. In Tenerife, T. californicum occurs in the Teno area in the most northwestern part. The Teno area is botanically very interesting and harbours numerous endemic vascular plant species. It is mountainous, consisting of basalt; the climate is rather dry and succulents dominate the vegetation, although in the upper part patches of relict laurel forest still exists. The valley where T. californicum occurs (at an altitude between 400 and 650 m) has a rich lichen flora in transition between xerophytic communities of the lower dry zone {Xanthorietum resendei Llimona, Parmelietum pseudotinctorum Klem.) and the more hygrophilous but xeroresistent communities of the submontane zone (Teloschistetum flavicantis Follm., Ramalinetum duriaei (Duvign.) Barkm.). It is interesting to note that Dimelaena radiata also occurs in this zone. Typical species of the xerophytic communities present in the zone include Ramalina bourgeana Nyl., Lecanora sulphurella Hepp, Caloplaca gloriae Llimona, Xanthoria resendei Poelt & Tavares and Lecidella subincongrua (Nyl.) Hertel & Leuckert. Species from the more humid, submontane zone are represented by Ramalina lacera (With.) Laundon, R. requienii (de Not.) Jatta, R. subfarinacea Nyl., Teloschistes flavicans (Swartz) Norman, Physcia adscendens (Th.Fr.) H. Olivier, Anaptychia ciliaris (L.) Korber, Parmelia saxatilis (L.) Ach., Parmotrema reticulatum (Taylor) M. Choisy and Rhizocarpon viridiatrum (Wulfen) Korber. Records of the lichen vegetation of six stands with T. californicum are given in Table 1. Huneck et al. (1980) reported 3-chlorodivaricatic acid to be the major constituent in T. mammosum. Analyses by S.H. also revealed the presence of 3-chlorodivaricatic acid in two Californian specimens of T. californicum. The material from Tenerife, however, has a yellow medulla and an investigation of

Domingo Bello y Espinosa (1817–1884) was an attorney and naturalist from the Canary Islands who lived in Mayagüez (Puerto Rico) between 1848 and 1878. He is the author of a two–part publication dated 1881 and 1883, which represents one of the first contributions on plant taxonomy made by an island resident. These studies include a total of 88 new taxa. Eighty–four of them are new taxonomic descriptions (3 genera, 59 species, 22 varieties) and 4 of them are new combinations. Eight of these species are still accepted either as published originally by Bello (3 species) or as basionyms of subsequent taxonomic combinations (5 names). Stahlia Bello is also currently accepted. Twelve of Bello's names are not legitimate (11 species, 1 variety). Bello did not leave a herbarium and published illustrations for only 3 of the new species that he described. Therefore, Bello's names need to be interpreted on the basis of his descriptions and indirect accounts primarily provided by Ignatz Urban. This German botanist had access to illustrations (made by Leopold Krug) and plant collections (from Krug and Agustín Stahl) that were originally identified with Bello's names. Here we assign neotypes for 42 of the 59 species described by Bello. The remaining 17 species not typified include 3 names typified in previous works, 9 illegitimate names, 3 names that we could not assign to any infrageneric taxon, and 2 names that are both illegitimate and can not be interpreted taxonomically. In addition, we lectotypify Caesalpinia monosperma (synonym of Stahlia maritima). We present a summary of the life of Domingo Bello that includes new data from archival research in the Canary Islands and Puerto Rico, as well as the only known portrait of him.

Table S1. Catalogue of photographs taken by Marie-Victorin in the Canary Islands. Photo description Black and white photo mounted in album Black and white mounted on cardboard Color plate number Publication reference Deck of Teide Steamer, trip from Cadiz to Las Palmas de Gran Canaria 1 top 1422 top left Deck of Teide Steamer, trip from Cadiz to Las Palmas de Gran Canaria 1 middle 1422 top right Tenerife. Santa Cruz. Harbor. Ship loading banana cases 1 bottom 1422 bottom left Tenerife. Santa Cruz. Cases with bananas 2 top 1422 bottom right Gran Canaria. Las Palmas. Alameda de Colón with sculpture honoring Christopher Columbus 2 middle 1423 top left Gran Canaria. Las Palmas. View of the city 2 bottom 1423 top right Gran Canaria. Las Palmas. Countryside view with Phoenix canariensis 3 top 1423 bottom left