Sabrina Naz
Department of Botany, University of Rajshahi, Rajshahi 6205, Bangladesh
Shah Md. Golam Gousul Azam
Department of Botany, University of Rajshahi, Rajshahi 6205, Bangladesh
Umma Nahar
Department of Botany, University of Rajshahi, Rajshahi 6205, Bangladesh
Nasrin Jahan Diba
Department of Botany, University of Rajshahi, Rajshahi 6205, Bangladesh
Oedogoniales, Bulbochaete, New records, Algae, Bangladesh
North-west Barind tract of Bangladesh
Conservation and Biodiversity
The present study was carried out in the north-west Barind tract situated in between 88.2°-89.2°E longitude and 24.6°-25.2°N latitude of Bangladesh from November 2000 to March 2005. The descriptions and identification of all studied taxa are based upon the investigation of fertile, mature specimens collected between the 1st week of November and 1st week of March. The present study has concentrated on the Bulbochaete specimens growing on aquatic plants including charophytes. All the collected specimens were preserved in Transeau’s solution. Camera lucida drawings were made at 400× magnification under a Reichert microscope (Nr. 309 209). Photomicrographs were taken by a Vivitar V3200 camera. Nannandrous, gynandrosporous, vegetative cells 16-19 × 40-58 µm, division of suffultory cell median or a little above median. Oogonium subdepressed-globose to globose patent, situated below a terminal setae, 50 × 39-43 µm. Oospore 46 × 35 µm, outer layer of spore wall scrobiculate, androsporangia up to 3-seriate, scattered, 12 ×13 µm. Dwarf males a little longer than the oogonia, 10 × 40 µm. Antheridium unicellular, exterior, 9 × 20 µm. Monoecious, macrandrous, vegetative cells 13-20 × 22-32 µm. Oogonium ellipsoid, situated below a vegetative cell or terminal setae. Oogonia 28-30 × 45-50 µm. Oospores 26-28 × 36-48 µm. Antheridium single or up to 3, 10-12 × 5-8 µm. Nannandrous, gynandrosporous, vegetative cells slender, 10.0-16.5 × 29.7-33.0 µm, division of suffultory cell basal. Oogonium depressed-globose, erect 42.9-45.2 × 33-36 µm. Oospore globose, 33-42 × 26-30 µm, spore wall smooth. Androsporangia single or two, epigynous, rarely scattered, 7-10 × 10 µm. Dwarf male situated on the suffultory cell, stipe straight, 8-9 × 16-20 µm; antheridium exterior, unicellular, 6-8 × 9-11 µm; basal division of the suffultory cell the exterior antheridium and the short dwarf males are the distinguishing characters of this species. Oogonia usually erect. Nannandrous, gynandrosporous, vegetative cells 24-36 × 10-13 µm, division of suffultory cell supramedian to superior. Oogonium depressed-globose, usually erect, situated below an androsporangium, 33 × 29 µm, division median. Oospore 30 × 27 µm, spore wall finely scrobiculate. Androsporangium single, epigynous, dwarf male situated on the oogonium, 16 × 10 µm. Antheridium 7 × 9 µm.
Bangladesh J. Plant Taxon. 15(2): 81-87, 2008 (December)
Journal