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Tuesday, August 21st, 2018

    Time Event
    7:01a
    [Botany • 2018] Eight New Species of Polystichum (subg. Haplopolystichum; Dryopteridaceae) from Limestone Caves in Guangdong and Yunnan, China, with Reference to Species Diversity in the Karst Terrains at High Elevations in Subtropical Areas

    Polystichum deltatum

    in Han, Liu & Zhang, 2018. 

    Abstract
    Eight new fern species of Polystichum subg. Haplopolystichum (Dryopteridaceae) are described and illustrated from Guangdong and Yunnan provinces, southern and southwestern China, respectively. These eight species include P. deltatum, P. gejiuense, P. malipoense, P. oblongipinnarum, P. pingbianense, P. rectum, and P. superum from Yunnan, and P. hanmengqii from Guangdong. Four of the eight species are described from high elevations (around 2000 m) demonstrating that the limestone areas at high elevations in subtropical areas are species-rich and deserve special conservation attention. All eight species are so far known only from single caves; they are all classified as Critically Endangered (CR) following IUCN Red List criteria.

    Keywords: Pteridophytes, Guangdong, high elevations, limestone caves, Polystichum subg. Haplopolystichum, Yunnan


    Meng-Qi Han, Yan Liu and Li-Bing Zhang. 2018. Eight New Species of Polystichum (subg. Haplopolystichum; Dryopteridaceae) from Limestone Caves in Guangdong and Yunnan, China, with Reference to Species Diversity in the Karst Terrains at High Elevations in Subtropical Areas. Phytotaxa. 365(2); 145–168. DOI:  10.11646/phytotaxa.365.2.3

    7:39a
    [Botany • 2018] Silvorchis vietnamica (Orchidaceae, Orchidoideae, Vietorchidinae) • A New Miniature Mycotrophic Species from southern Vietnam

    Silvorchis vietnamica Aver., Dinh & K.S. Nguyen

    in Averyanov, Nguyen, Nguyen, Dinh & Maisak, 2018. 

    Abstract
    A second species of Silvorchis, until now considered to be a presumably extinct monotypic genus endemic to western Java has been discovered in southern Vietnam. The species, here named as Silvorchis vietnamica, is described and illustrated, with data on its distribution, ecology, phenology and estimated conservation status. A key for identification of the two known species of the genus is also provided. The taxonomic affinities and phylogenetic placement of the newly discovered plant are briefly discussed.

    Keywords: Flora of Vietnam, plant diversity, Silvorchis


    Silvorchis J. J. Sm. 
    (Smith 1907, p. 2, Comber 1990, p. 60) 

    Type: S. colorata J. J. Sm. 
    2 species in western Java and southern Vietnam.

    Silvorchis colorata J. J. Sm. 
    (Smith 1907, p. 3, Comber 1990, p. 60)
     Described from Java.  

    Distribution, habitat and conservation status: Small achlorophyllous terrestrial herb. Only found once in western Java and only known from the type specimen. Endemic. Humid evergreen montane forests. Around 1600 m a.s.l. 
     Presumably ‘Extinct’ (EX).


    Figure 1. Silvorchis vietnamica sp. nov. Flowering plant in its natural habitat.

    Photos by Van Dzu Nguyen and Quang Diep Dinh,
    correction and design by L. Averyanov.

    Silvorchis vietnamica Aver., Dinh & K.S. Nguyen sp. nov.

    Etymology: Species name refers to country of its origin.



    Leonid V. Averyanov, Van Dzu Nguyen, Khang Sinh Nguyen, Quang Diep Dinh and Tatiana V. Maisak. 2018. Silvorchis vietnamica (Orchidaceae, Orchidoideae, Vietorchidinae), A New Miniature Mycotrophic Species from southern Vietnam. Nordic Journal of Botany.  e01883. DOI: 10.1111/njb.01883
    Researchgate.net/publication/318861665_Present_data_on_Vietnam_orchid_inventory

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