Cissus erecta (Vitaceae), a new non-viny herbaceous species from Mt. Popa, Myanmar

Cissus erecta, a new endemic species of Vitaceae from Myanmar, is described and illustrated. The species is similar to C. aubertiana in habit, but it is readily distinguished by its less deeply lobed leaves with serrate margins, persistent stipules, and larger berries. This species is also similar to C. woodrowii in leaf shape, but it is distinguished by having herbaceous habit, leaves with serrate margin, greenish and persistent stipules, compound umbel, and larger globose berries.

Greeneria saprophytica sp. nov. on dead leaves of Syzygium cumini from Chiang Rai, Thailand

Greeneria saprophytica sp. nov. is described from fallen Syzygium cumini leaves collected in northern Thailand. The genus Greeneria is monotypic and represented by the type species G. uvicola. The novelty and placement of G. saprophytica is confirmed based on phylogenetic analyses of the 28S nuclear large subunit DNA (nuLSU). The new species differs from G. uvicola in the dimensions of acervular conidiomata, conidiogenous cells and conidia. The phialide collarette with a serrate margin, a rare feature in conidial fungi, is characteristic of the genus.

Studies on Morpho-microanatomical Evaluation of the Leaves of Tridax procumbens Linn (Asteraceae)

The present study deals with the macro and microscopical studies of Tridax procumbens Linn.leaf. Some distinct characters were observed while studying their transverse sections. Macroscopically, the leaf’s shape was lanceolate to ovate measuring 7 cm long and 1-4 cm wide with irregularly serrate margin and pubscent on both sides. Microscopically, the midrib and laminar region showed a distinct epidermis. The upper epidermis was bilayer, with a small, rounded shape, covering multicellular trichome and the lower epidermis had single layer, elongated cells, arranged closely. Physiochemical and preliminary phytochemical studies of the leaf were also carried out. The present study might be useful to supplement information in regard to its identification parameters. Keywords: Leaf; Macroscopical; Microscopical; Tridax procumbens. © 2010 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved. DOI: 10.3329/jsr.v2i3.4775 J. Sci. Res. 2 (3), 515-521 (2010)

RELATIONSHIP OF TAXA IN THE GENUS MEDICAGO AS REVEALED BY HYBRIDIZATION. VI. M. LACINIATA × M. SAUVAGEI

Medicago laciniata (L) Mill. and M. sauvagei Nègre were intercrossed in both directions. The F1's of the cross M. sauvagei ♂ × M. laciniata ♀ were chlorophyll deficient, and F1's of the reciprocal cross were normal green, indicating cytoplasmic influence. In the F2 of chlorophyll deficient F1's, segregation for chlorophyll deficiency took place, revealing interaction of cytoplasmic factor/s with gene/s of M. laciniata. Some transmission of the cytoplasmic factor through pollen of M. sauvagei was indicated by somatic chlorophyll deficiency in sectors of a few leaves of F1's of M. laciniata ♂ × M. sauvagei ♀. The serrate margin leaf character of M. sauvagei and the apical coil spininess of M. laciniata were transmitted as recessives. Because of the poor seed set in F1's and high seedling mortality of F2's, the number of genes determining these characters is not certain. The two taxa are considered separate species because of low interfertility; their close phylogenetic relationship, however, is indicated by normal meiosis in F1's and by hybridization.