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Bhattacharyya, P. K.
- The Vascular Cambia of Dodder and its Allies
Authors
1 Burdwan University, Burdwan, IN
Source
Nelumbo - The Bulletin of the Botanical Survey of India, Vol 30, No 1-4 (1988), Pagination: 149-155Abstract
The vascular cambia of 20 species of the dodder and its allies belonging to the CassythaceaE, Convolvulaceae and Cuscutaceae were surveyed to assess their phenetic and phylogenetic significance. In natural condition all of them contain anomalous cambia. The Cassythaceae bore transitory cambium in the normal position but atypical by asmmetric activity. (The Cambium alternatelt retards accemtuates xylem formation on several segments and there are profuse sehizongenous spaces in wood. Haustoria contains both traheids and vessels).
In stems and ischolar_mains of the Convolvulaceae a series of widely different anomalous cambia were found which sometimes differed in stems and ischolar_mains of the same species. Stems of arborescent group had bands of interxylary phloem in concentric rings, while in the primitive twiners these are arranged in radial plates. In general, a tendency was to increase the proportion of soft tissue. In Cuscutaceae the specified anomaly was the interfascicular cambium. Ray initials were absent but fusiform initials differentiated into profuse parenchyma cells and a few vessel elements.
Haustorium develops only imperforate tracheary elements. The evolutionary history vascular cambium in the Convolvulaceae was mainly one of reduction in activity and area. Thus the vesselless haustorium of Cuscutaceae. may be regarded as a reduced farm in with the vessel bearing haustorium of Cassythaceae. It 1s also concluded that the primitive condition of Cuscutaceae is possibly derived from the general condition of Convolvulaceae.
- Bryophyte Flora of Barddhaman District, West Bengal
Authors
1 Deptt. of Botany, Burdwan University, Burdwan 713104, IN
Source
Nelumbo - The Bulletin of the Botanical Survey of India, Vol 47, No 1-4 (2005), Pagination: 11-42Abstract
The present paper deals with the first information on the bryophyte flora of Barddhaman district, West Bengal. Altogether 26 species under 18 genera belonging to 13 families have been reported. Each species is appended with relevant field data, necessary illustrations and diagnostic features. Archilejeunea planiuscula (Mitt.) Staph. and Lejeunea boninensis Harikawa are the new records to the known flora of the Indian Union- The Nomenclatural Type of Utricularia capillacea Willd. (Lentibulariaceae)
Authors
1 Department of Botany, University of Burdwan, Burdwan - 713 104, West Bengal, IN
Source
Nelumbo - The Bulletin of the Botanical Survey of India, Vol 45, No 1-4 (2003), Pagination: 195-200Abstract
No Abstract.- A Comparison of the Angiosperm Phylogeny Group Classification (2003) with System of Takhtajan (1997) and Cronquist (1988)
Authors
1 Department of Botany, University of Burdwan, Burdwan 713 104, WB, IN
2 Govt. College of Education, Banipur, 24 Parganas (N) 743 233, WB, IN