Luis Fernandez-Alonso, JoseAriza-Cortes, WilliamCortes-B, Rocio
24页
查看更多>>摘要：The new genus and species Mahechadendron puntecascarillo are described based on specimens first collected in the '60s but only recently found with flowers and fruits. It grows in the moist forests of the Middle Magdalena River in Colombia. The highly durable wood of this forest tree species is still used intensively for construction. Morphological and rbcL sequence data place this genus in the Vochysiaceae, most likely closely related to Callisthene. Mahechadendron shows inflorescences in compound dichasia, compact, only developed laterally, traits not previously recorded in this family. Mahechadendron puntecascarillo exhibits the tiniest flowers known in the Vochysiaceae, with the fourth sepal basally sacciform, and copious villous-lanose indumentum in the internal portions of the fourth sepal, petal, filament, and ovary; the flowers also have the single petal non-clawed, a feature not very common in Vochysiaceae. In addition, the capsular fruit has a thick and persistent central column, and the exocarp is fused to the endocarp even at maturity, with seeds unilaterally winged. Moreover, this species bears mirror-image flowers, indicating enantiostyly, a sexual polymorphism already known in some Vochysiaceae. The conservation status suggested for the new species is Endangered (EN). A key to the genera of Vochysiaceae is provided.
查看更多>>摘要：Grasses are agriculturally, economically and ecologically dominant among plants. Their fungal diversity is fascinating but has been relatively poorly studied or restricted to a few important hosts or pathogens. Therefore, numerous grassinhabiting fungal species are awaiting discovery or re-study based on morphology and molecular phylogeny. In an ongoing study of grass-inhabiting fungi in Thailand, two interesting saprobic members of Sodariomycetes were collected. Based on morphology, coupled with combined gene analyses of LSU and ITS sequence data, they were identified as Dinemasporium pseudostrigosum and Robillarda africana belonging to Chaetosphaeriaceae and Sporocadaceae, respectively. This is the first report of the two species for Thailand as well as the first record of R. africana occurring on grasses. The newly collected species are compared to other related species and comprehensive descriptions and photomicrographs are provided.
查看更多>>摘要：Salicornia is a cosmopolitan genus having a high complicate taxonomy even described as a nightmare. Morphologically members of Salicornia are halophyte, annual, articulated, and succulent herbs with cortical palisade, opposite decussate scale-leaves, thyrsoid cymes, flowers packed in cauline depressions and the diaspore composed of l-seeded utricle. Salicornia is a priceless edible vegetable, considered as a favourable resource for cultivation in arid and semiarid coastal zones. Concerning the molecular data, although various studies were published, the situation is still quite obscure, at least for some taxa. Also, no DNA markers were used to analyses the genomic variability of the populations, up to date. In the present study, the genetic diversity of 102 individuals of S. persica (15 populations) were studied using 10 Start Codon Targeted (SCoT) markers. High polymorphic bands (94.18%), polymorphic information content (0.27), and allele number (1.38) showed SCoT as a reliable marker system for genetic analysis of this species. We used SCoT molecular marker for our genetic investigation with the following aims: 1) investigate genetic diversity both among and with date S. persica, 2) identify genetic groups within the 15 populations studied, and 3) produce data on the genetic structure of S. persica populations. The results obtained revealed a high within-population genetic variability.
Zhang, YuGuo, Ji-ShuKociolek, John PatrickLi, Yan-Ling...
12页
查看更多>>摘要：Navicula fuxianturriformis sp. nov., collected from Lake Fuxian, Yunnan Province, China, is described as a new species based on light and scanning electron microscope observations. N. fuxianturriformis sp. nov. has lineolate areolae closed by hymenes internally and a peculiar structure of the raphe system where the raphe is elevated internally on a thin longitudinal rib that is laterally expanded at the central area; features that assign it to the genus Navicula. The key diagnostic features of this new species include: 1) lanceolate valves with the cuneate to apiculate apices, 2) mostly long, slit-like, partly round rectangular areolae on the valve exterior and round to rectangular areolae internally, 3) external distal raphe fissures that are hooked opposite one another, and 4) the oval-elliptical central area, with two to five pairs of irregularly shortened striae. This combination of features distinguishes N. fuxianturriformis from congers such as N. turriformis, N. turris, N. reinhardtii, N. hoevsgoelreinhardtii, N. mongolreinhardtii, N. apiculatoreinhardtii or N. apiculatoreinhardtii f. biseriata. A discussion of the morphological features of this taxon and morphologically-similar species is presented. These findings increase our understanding about the morphology and distribution of the genus Navicula in China.
查看更多>>摘要：The Southern and Southeastern regions of Brazil present the highest species richness of Sisyrinchium, and the taxa are mainly distributed in the Atlantic Forest Biome. Here, three new species belonging to Sisyrinchium sect. Viperella from this biome are described: S. caratuvense is endemic to the high altitude grasslands of eastern Parana, S. usneoides is endemic to the campo rupestre phytophysiognomy in southern Minas Gerais, and S. iguazuanum has a wider distribution, occurring in the grasslands of western Santa Catarina and Parana (Brazil), and eastern Misiones (Argentina). Descriptions, illustrations, comparisons to related taxa and conservation status are provided.
查看更多>>摘要：Two new species of the genus Lactarius from India, Lactarius indoevosmus (L. subg. Lactarius) and L. kanadii (L. subg. Plinthogalus) are presented with detailed descriptions, line drawings, photomicrographs, and comparisons with related species. The novelty and placement of these taxa within the genus Lactarius are confirmed with an ITS-based phylogeny.
查看更多>>摘要：Arenaria izmirensis is described as a new species from the mountain of Mahmut (district of Izmir, Western Turkey). The new species is morphologically similar to A. tmolea, A. sipylea, A. uninervia, and A. cretica from which it differs in having a procumbent habit, different habit and shapes basal leaves, densely glandular sepals, and smaller petals. A detailed description, ecological data, original drawings and photos, and the conservation status are given.
Alves, Flavio MacedoMeyer, Pablo BurkowskiDe Souza Assis, Leandro Cezanne
8页
查看更多>>摘要：A new species, Mezilaurus conceicionensis (Lauraceae), from Southeastern Brazil, was discovered during fieldwork at Serra da Ferrugem, State of Minas Gerais. This new species is described and illustrated in this study, being distinguished from the remaining species of Mezilaurus species mostly by its globoid fruits. An identification key of the species of Mezilaurus from Southeastern Brazil is presented.
Vlasenko, Anastasia V.Vlasenko, Vyacheslav A.Kabilov, Marsel R.
8页
查看更多>>摘要：Diacheopsis is a small genus of myxomycetes with about 18 species reported around the world. Diacheopsis species are recorded in Eurasia, North and South America, Australia and New Zealand. A new species of Diacheopsis from coniferous forest of Asian part of Russia is described and illustrated. The new species occurred on a dead tree of Pinus sylvestris. It differs from all known species of the genus Diacheopsis in the sporocarps being drab grey, beige colours and the spores have warts up to 0.4 mu m in total height. By SEM observations the warts are dense, abundant and regularly distributed, welldeveloped, with coralloid projections on the apex of each wart. Sequences for SSU rDNA of the new Diacheopsis species were generated. Preliminary phylogenetic analyses based on partial 18S rDNA sequences support the establishment of the new species.
Harper, Margaret A.Morales, Eduardo A.Van De Vijver, Bart
8页
查看更多>>摘要：A new species of araphid diatoms with bilobate ends is described as Staurosirella tigris sp. nov. It was found in mid Miocene glacial-lacustrine sediments in the Friis Hills, Antarctica. The new diatom is placed in Staurosirella because it has striae composed of apically-oriented lineolae, separated by long, thin vimines, and it lacks rimoportulae. It can be easily distinguished by its rectangular valve shape with bilobate ends, differing from Staurosirella grunowii, another four lobed Miocene species, by having a rectangular central portion to its valves instead of being cross-shaped with the four lobes arising from a common central area. Also, the distribution of the new species is different, to date only being found in Antarctica, while S. grunowii is restricted to the Northern Hemisphere.
NSTL
Magnolia Press