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The paper presents the results of taxonomical investigation of the genus Cladonia Hill ex P. Browne from King George Island. Individuals belonging to this lichen genus were studied using methods of classical herbarium taxonomy supported by chemical analysis. Fourteen species have been recognized in the study area, with C. asahinae J.W. Thomson being reported from King George Island for the first time, and C. cervicornis subsp. mawsonii reported as new for the South Shetland Islands. The occurrence of C. cariosa is confirmed for the Antarctic region. The diagnostic characters, ecology and important remarks referring to particular species are briefly presented. An updated key for identification of the species from King George Island and neighbouring islands of South Shetlands is included.
Clear−cutting impacts site conditions seriously. However, in nutrient−poor sites the effects of stand removal can be minor than in nutrient−rich sites. The aim of this work was to assess whether the clear−cut can improve species diversity of ground Cladonia species, which decline has been observed in forest communities. In stands of different age classes (10, 11−20, 21−40, 41−60, 61−80, 81 years) in the Przymuszewo Forest District (northern Poland) ground Cladonia species and their cover were recorded on research plots (10×15 m). A total of 24 species were identified in the study area. There were more Cladonia species and they were more abundant in young stands (<20 years old) than in stands older than 60 years. Nine species are significantly more frequent and demonstrated high fidelity in young stands and only one was characteristic for old stands. Composition of Cladonia species depended primarily on stand age and subsequently on canopy or bryophyte cover. In nutrient−poor sites clear−cutting is favourable for Cladonia species diversity.
This paper is the first report on Cladonia species from Ardahan, a north-eastern province of Turkey. A circumpolar boreal-low arctic species, Cladonia acuminata, rarely reported from Asia, and the recently described Cladonia monomorpha are reported as new for Turkey. Their detailed descriptions and taxonomical remarks are provided. Localities of other ascertained Cladonia species in the province supplement the knowledge of their distribution patterns in the country. In addition, the typically corticolous/lignicolous species Vulpicida pinastri is mentioned as also growing on primary squamules and podetia of C. pyxidata.
The paper presents the results of taxonomical work concerning the lichen genus Cladonia Hill ex P. Browne from the Arctic island Spitsbergen (Svalbard). The work is based on studies of herbarium material collected during several Polish expeditions (deposited in Polish herbaria) and on the field work carried out by the author in 2002. The materials originate from the west coast of the island. Specimens were studied using methods of classical taxonomy supported by chemical analysis of the lichen substances. Twenty-seven taxa have been recognized in the materials examined. The description (morphological characters and chemistry), ecology and distribution of particular taxa are presented. An updated key for identification of taxa is included. Habitus photos of the species are submitted.
The paper is based on field studies dealing with the lichen genus Cladonia Hill ex P. Browne (Cladoniaceae) carried out by the author in the region of Spitsbergen in 2002 as well as taxonomical work and revision of herbarium material, collected during several earlier Polish polar expeditions to this part of the Arctic. As the result not reported so far from the island species Cladonia stygia (Fr.) Ruoss, C. trassii Ahti, C. verticillata (Hoffm.) Schaer. have been determined. Besides, the presence of very rarely recorded taxa C. crispata var. cetrariiformis (Delise) Vain., C. merochlorophaea Asahina and Cladonia symphycarpia (Flörke) Fr. is confirmed and their new localities are given. Furthermore, the presence of C. coccifera s.str. is also substantiated.
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