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Marginal parts of the thallus in Lecanora geophila : Lectotype of Placodium geophilum in UPS (a), isotype of Lecanora teretiuscula in WU (b), ‘ Siphula nepalensis ’ in GZU (c, d).
Source publication
OBERMAYER, W. & KANTVILAS, G. 2003. The identity of the lichens Siphula himalayensis and Lecanora teretiuscula. – Herzogia 16: 27–34. The lichens Siphula himalayensis (Räsänen) Kantvilas and Lecanora teretiuscula Zahlbr., both recorded from the southeastern Himalayas and adjacent Tibetan regions, are regarded as conspecific with the widespread Arct...
Citations
... Siphula Nyl. is a genus of foliose to fruticose lichens that had long bewildered taxonomists owing to its lack of ascomata and highly variable morphology and chemistry. Advances in the knowledge of the group over the last 50 years have seen the clarification and description of new species, mainly from New Zealand and Tasmania (Galloway 1983;Kantvilas 1987Kantvilas , 1994Kantvilas , 1996Kantvilas , 1998, mainland Australia (Kantvilas 2004), South-East Asia (Obermayer & Kantvilas 2003;Kantvilas et al. 2005), southern Africa (Mathey 1971;Kantvilas et al. 2003) and South America (Kantvilas & Elix 2002;Marcano 2021a, b). The first investigations of the phylogenetic position of Siphula (Platt & Spatafora 2000;Stenroos et al. 2002) placed it in the Icmadophilaceae. ...
The term ‘siphuloid’ is introduced for a suite of distinct lichen genera with a superficially similar foliose to fruticose morphology, notably Siphula , Siphulella , Siphulopsis , Parasiphula and Knightiellastrum . Three new species are described: Parasiphula squamosa Kantvilas (from Tasmania and New Zealand), characterized by a whitish grey, squamulose or minutely foliose thallus lacking lichen substances or containing traces of atranorin; Siphula capensis Kantvilas (from southern Africa), containing baeomycesic and squamatic acids, and characterized by robust, broadly flattened, rounded lobes with thickened apices; and S. crittendenii (from the Caribbean but with an outlying collection from Queensland, Australia), an epiphytic species containing thamnolic acid, with fragile, flattened lobes mostly to 10 mm long and 1−5 mm wide, with ragged or much-divided apices. Salient features of the species of Parasiphula are summarized and a first key for this genus is presented. Infrageneric problems in Siphula are also discussed briefly.
... Lecanora geophila (Th. Fr.) Poelt is similar to L. chondroderma in morphology, chemistry and habitat, whereas the former forms a yellowish crustose, squamulose to placodioid thallus with loboid projections or phyllidia or terete lobes and epruinose, pale, flat to convex apothecia, including usnic acid, zeorin and methylplacodiolic acid (Brodo 1981;Obermayer and Kantvilas 2003); the latter presents a totally pruinose, squamulose to lobate thallus that never forms phyllidia and terete lobes, pruinose, reddish-brown to black apothecia, numerous rhizinose strands and absence of methylplacodiolic acid. Description. ...
New collections of six Squamarina species from type localities in China were studied. The comparison of morphological characteristics and secondary metabolites with those of the type specimens and phylogenetic analyses suggest that S. callichroa and S. pachyphylla belong to Rhizoplaca , S. semisterilis belongs to Lobothallia and S. chondroderma should be retained in Lecanora temporarily. Only two species, S. kansuensis and S. oleosa , remain in Squamarina . The new combinations Lobothallia semisterilis (H. Magn.) Y. Y. Zhang, Rhizoplaca callichroa (Zahlbr.) Y. Y. Zhang and R. pachyphylla (H. Magn.) Y. Y. Zhang are proposed. Detailed descriptions to aid the identification of these species, distributions and phylogenetic trees, based on multiple collections, are presented. The generic concept of Squamarina is recircumscribed in this study.
... 257, accompanied by a note on the label that in this strain 4-spored and 8-spored asci should be equally frequent and the ascospores being 16–18 × 5–7 µm (Santesson 1998). The strain has also been reported from Greenland inhabiting even the type specimen of the host lichen (Obermayer & Kantvilas 2003). It needs to be further studied as are other records of C. epipolytropa on single specimens of Lecanora baicalensis and L. chondroderma (Poelt & Grube 1993). ...
A study on the taxonomy, morphology and anatomy of the lichenicolous species of the genus Cercidospora (Dothideales, incertae sedis) growing on lichens of the genera Lecanora (Lecanoraceae), specifically of the L. polytropa group and the L. saxicola group (i.e. L. muralis sensu auct. group, Protoparmeliopsis spp.), Rhizoplaca (Lecanoraceae) and Squamarina (Stereocaulaceae) is presented. The following species are proposed as new: Cercidospora barrenoana on Rhizoplaca peltata, and C. melanophthalmae on Rhizoplaca melanophthalma. C. stenotropae is proposed provisionally; this fungus grows on Lecanora stenotropa and other taxa of the L. polytropa group. A key for the species of the genus Cercidospora treated is provided.
... Although some of these new taxa later proved to be "morphological" variants of already described species (see e.g. OBERMAYER & KANTVILAS 2003), there nevertheless remain a lot of well defined ("good") taxa. ...
... It was recorded in the Himalayan taxon, S. himalayensis (Räsänen) Kantvilas (KANTVILAS 2002), but this lichen is now known to be unrelated to Siphula and synonymous with Lecanora geophila (Th.Fr.) Poelt (OBERMAYER & KANTVILAS 2003). Similarly, caloploicin has never been recorded in Siphula either. ...
A brief overview of the current state of lichen diversity in Nepal is provided. Nepal has a diverse lichen flora. Lichen studies in Nepal were initiated by foreign academics and are now being pursued by several Nepali researchers as well. Lichens have attracted many due to their diversity and distinctive features, as well as their use as bioindicators, food, and medicine. In Nepal, all lichens are protected by government law, and collecting them requires authorization. Future research should concentrate on demographic studies, nutritional value studies, efficacy studies, toxicity studies, and secondary metabolite studies, which are not commonly conducted. These investigations will help to expand Nepal’s knowledge of lichen flora in the future.
Pseudephebe pubescens is reported, described and illustrated from the Chinese Hengduan Mountains region. It is characterized by its slender and isotomicdichotomous branched filaments forming tiny cushions, a cortex of longitudinally oriented hyphae that become prosoplectenchymatous at the surface, medullary hyphae that are not ornamented, and the absence of lichen substances. It grows on arctic-alpine rock.
