Summary Clusia falcata (Clusiaceae), a new species from Chiapas, Mexico, is described and illustrated. This taxon distinctive for its leaves, among the narrowest of all known species, having lanceolate to oblong laminas that are mostly 10 – 15 × 2 2.5 cm. The flowers have quadrangular perianth with succulent petals, non-resiniferous androecium gynoecium. Staminate androphore bearing 18 24 short...

A quadrangular embedding of a graph in surface Σ, also known as quadrangulation is cellular which every face bounded by 4-cycle. Σ minimal if there no (simple) smaller order Σ. In this paper we determine n(Σ), the for all surfaces, both orientable and nonorientable. Letting S0 denote sphere N2 Klein bottle, prove that n(S0)=4,n(N2)=6, n(Σ)=⌈(5+25−16χ(Σ))/2⌉ other surfaces where χ(Σ) Euler chara...

Pollen morphology of 18 species from the genus Impatiens collected different localities in Nilgiris, Tamil Nadu was evaluated using scanning electron microscopy (SEM) during period February 2017 to November 2019. From observation pollen it found be structurally monad; prolate, sub-prolate and prolate-spheroidal equatorial view; circular, rectangular, triangular, quinquangular, elliptic quadrangu...

Palaeosiamoglaris hkamtiensis sp. nov. of the family Prionoglarididae is described from Hkamti amber (ca. 110 Ma), together with Psyllipsocus myanmarensis nov., third fossil psyllipsocid species Noije Bum Hill 98 Ma). Based on current observations we discuss synapomorphic characters proposed to define tribe Siamoglaridini. is, inter alia, characterized by maxillary palpomere 3 ca. 0.66 times as...

in this paper, we first define spaces of single difference sequences defined by a sequence of orlicz functions without convexity and investigate their properties. then we extend this idea to spaces of double sequences and present a new matrix theoretic approach construction of such double sequence spaces.