Pseuderanthemum pubescens sp. nov. (Acanthaceae) from Thailand

Pseuderanthemum pubescens T. Choopan & P. J. Grote, a new species from southeastern Thailand is described and illustrated. It is distinguished from P. longistylum J. B. Imlay by leaves being pubescent instead of glabrous and by the corolla lobes being purple with reddish purple dots on all 5 lobes instead of dotted on lower lip only.     

Three new synonyms of Rungia stolonifera (Acanthaceae) from China and Vietnam

Examination of relevant type materials and living plants has revealed that Rungia axilliflora, R. densiflora and R. evrardii are conspecific with R. stolonifera. A lectotype is designated for the name R. stolonifera. Rungia sect. Stoloniferae is thus recognised as including two species, viz. R. stolonifera and R. mina.     

Ruellia nocturna sp. nov. (Acanthaceae) from Central Somalia

Ruellia nocturna , a large- and night-flowering shrub from Central Somalia is described and illustrated, and its relationship to other large-flowered species occurring in the area is discussed.     

Phyllanthus brunelii sp.nov. (Euphorbiaceae) from Thailand

Phyllanthus brunelii Roux, a new shrubby species from Thailand is described. P. brunelii has apparently until now been confused with P. reticulatus Poir. Its pollen structure suggests affinities between the subgenera Kirganelia (A. Juss.) Webster and Gomphidium (Baill.) Webster.     

Liparis rubescens sp. nov. (Orchidaceae) from Thailand

In the context of an ongoing revision of the orchid genus Liparis in Thailand, we describe and illustrate a new species under the name L. rubescens Tetsana, H. A. Pedersen & Sridith. Morphologically, it is particularly similar to L. dumaguetensis Ames from the Philippines, but it differs in the shape of the lateral sepals and in several characters of the labellum. Among the Liparis species already known from Thailand, L. atrosanguinea Ridl. bears a certain resemblance to the new species, but not so much as to make misidentifications likely. So far, L. rubescens is only known from Khao Nan National Park in the southern Thai province of Nakhon Si Thammarat, but we suggest that it should also be searched for in other parts of peninsular Thailand, southernmost Myanmar and Peninsular Malaysia.     

Typhonium muaklekense sp. nov. (Araceae) from Thailand

Typhonium muaklekense D. Sookchaloem & S. Maneeanakekul is described and illustrated. This new species resembles T. roxburghii Schott and T. varians Hett. & Sookch. in the spathe. Drawings, photographs and a table comparing diagnostic features of T. muaklekense, T. roxburghii and T. varians are provided.     

Oberonia pygmaea sp. nov. (Orchidaceae) from Thailand

In the context of an ongoing revision of the orchid genus Oberonia in Thailand, we describe and illustrate a new species under the name O. pygmaea Bunpha, H. A. Pedersen & Sridith. Vegetatively, the tiny new species is particularly similar to O. rufilabris Lindl. (widespread in mainland southeast Asia, including Thailand), whereas its floral morphology comes closest to the much larger O. costeriana J. J. Sm. from Sumatra, Java and Sulawesi. So far, O. pygmaea is only known from Pang Ung in the northern Thai province of Mae Hong Son, but we suggest that it should also be searched for in hill evergreen forest in adjoining parts of the Dawna Range, both in Thailand and Myanmar.     

Geostachys angustifolia sp. nov. (Zingiberaceae) from Thailand

A new species of Geostachys (Bak.) Ridl. is described, G. angustifolia K. Larsen sp. nov., and a key to all species of the genus found in Thailand, Cambodia and Vietnam is presented.     

Pogostemon nudus sp. nov. (Lamiaceae) from Thailand

A new species of Pogostemon Desf., P. nudus Bongcheewin & Pramali, is described, illustrated and compared with the similar P. menthoides from Thailand. Morphological characters, especially the micromorphology of nutlets and leaf epidermis, and conservation status in accordance with the IUCN red list categories and criteria are described and discussed. In addition, a key to all species of P. sect. Pogostemon known from Thailand is presented.     

Piper viridescens sp. nov. (Piperaceae) from Thailand

Piper viridescens sp. nov. is proposed based on material from northern Thailand. The new species is described and illustrated, resulting from a revision of the genus in Thailand. The new species is most closely related to P. boehmeriifolium (Miq.) C. DC. A table comparing diagnostic features of P. viridescens, P. boehmeriifolium and P. retrofractum is provided.     

Aristolochia helix sp.nov. (Aristolochiaceae) from Thailand

A new species of Aristolochiaceae, Aristolochia helix , is described from Thailand and contrasted to its nearest ally, A. arenicola.     

爵床科孩儿草属一新组

描述了爵床科孩儿草属的一个新组-密花孩儿草组Rungia sect．Stoloniferoe C．M．Gao＆Y．F．Deng。本新组花序不偏向一侧,苞片均能育,同形。     

Heterostemma trilobatum sp. nov. (Apocynaceae: Asclepiadoideae) from Thailand

A new species, Heterostemma trilobatum A. Kidyoo & Thaithong has been discovered in northern, northeastern and southeastern Thailand. It is here described, illustrated and meticulously compared with a morphologically similar species, H. xuansonense T. B. Tran & J. Hw. Kim. Both species resemble each other, having sessile to subsessile cymes, five glands on the inside of the calyx and dark red to purplish red ovate corona lobes. However, H.trilobatum is markedly differentiated by much smaller size of flowers and the presence of peculiar trilobed corona appendages.     

Samuelsia mundiveteris sp. nov. from Thailand

Samuelsia mundiveteris is described as the first member of the genus from the Old World tropics.     

Lepidagathis benojiana sp. nov. (Acanthaceae) from the Western Ghats,Kerala, India

Lepidagathis benojiana, a new species of Lepidagathis, collected from the Idukki district, Kerala, southern Western Ghats, India is described along with photographs. The new species is closely allied to L. chlorostachya Nees. but differs from the latter in its height, length of petiole, position and number of spikes, length of peduncle, length of floral whorls, colour of flower, colour and nature of stamens, nature of fruit and shape of the seed.     

Candida ruelliae sp. nov., a novel yeast species isolated from flowers of Ruellia sp. (Acanthaceae)

Two novel yeast strains designated as 16Q1 and 16Q3 were isolated from flowers of the Ruellia species of the Acanthaceae family. The D1/D2 domain and ITS sequences of these two strains were identical. Sequence analysis of the D1/D2 domain of large-subunit rRNA gene indicated their relationship to species of the Candida haemulonii cluster. However, they differ from C. haemulonii by 14% nucleotide sequence divergence, from Candida pseudohaemulonii by 16.1% and from C. haemulonii type II by 16.5%. These strains also differ in 18 physiological tests from the type strain of C. haemulonii, and 12 and 16 tests, respectively, from C. pseudohaemulonii and C. haemulonii type II. They also differ from C. haemulonii and other related species by more than 13% sequence divergence in the internal transcribed spacer region. In the SSU rRNA gene sequences, strain 16Q1 differs by 1.7% nucleotide divergence from C. haemulonii. Sporulation was not observed in pure or mixed cultures on several media examined. All these data support the assignment of these strains to a novel species; we have named them as Candida ruelliae sp. nov., and designate strain 16Q1(T)=MTCC 7739(T)=CBS10815(T) as type strain of the novel species.