Peyssonnelia obscura var. bombayensis [Status Unaccepted]   Borgesen,  1935 (Algae)
Organism information awaits expert curation
Class: Florideophyceae

Color: Crusts brownish red in color.

Crusts thin, and adhere to the substratum by unicellular rhizoids from all its undersurface except the edge. It is mainly found attached to the surfaces of shells and rocks. The shape of the thallus is orbicular, with radial strips.

The hypothallial cells are straight, arranged in parallel rows, 28-34 µm x 13-14 µm in surface view and 25-27 µm in sectional view. Perithallium arising from the hypothallium is made of dichotomously divided short filaments. The basal cells of the perithallium are more or less similar to those of the hypothallium. The cells just above the basal perithallium are longer than broad, about 13-18 µm long and 9-12 µm broad. Above the basal perithallium the thallus is 2-3 layered. The cells become gradually reduced in size, the outermost being only 5-7 µm in diameter. In surface view, the uppermost cells are arranged in long straight rows composed of roundish to polygonal cells, measuring about 13.5 µm broad.

Tetraspores and carpospores are found in nemathecia, scattered over the surface of the thallus. Fertile thallus with tetrasporangial nemathecia in sectional view measuring 180-190 µm thick. The thickness of the nemathecium alone is about 95-105 µm. The tetrasporangia are cruciately divided and intermingled with 6-8 celled paraphysis. The terminal and the basal cells of the paraphyses are smaller in size with a measurement of 6.6-9.9 µm x 4-6.6 µm. The middle cells are narrow and elongated and about 25-27 µm x 3.3-4 µm. The tetrasporangia are 72-79 µm long and 3-46 µm broad.
The thallus with the female nemathecia are 198-205 µm in thickness and the nemathecia alone measure 113-115 µm. The carpospores are 30-35 µm in diameter, produced in chains of 2-4, on gonimoblast filaments. Paraphyses are 8-9 celled intermingles with the carpospores. The filaments of the paraphyses are often bifurcated at their tips.

Synonym (s)

Common Name (s)
Economic Importance and Threats



• Kerala, Kollam Coast INDIA (Record: 12/1992)
• Maharashtra, Mumbai Coast INDIA (Record: 1935)
• Gujarat, Veraval INDIA (Record: 1967)
• Andhra Pradesh, Vishakhapatnam INDIA (Record: 1970)
• Maharashtra, Mumbai INDIA
• Andhra Pradesh, Vishakhapatnam INDIA

Literature Source(s)
  • Silva, PC; Basson, PW and Moe, RL (1996) Catalogue of the benthic marine algae of the Indian Ocean University of California Press 79 1259 pp Available at - NIO, Goa
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at -
  • Sindhu, P and Panikkar, MVN (1995) Observations on Peyssonnelia obscura Web. V. Bosse. var. bombayensis Boergesen (Peyssonneliaceae, Cryptonemiales) from Kerala, India Seaweed Research and Utilisation Seaweed Research and Utilisation Association 17(1-2) 147-150 Available at - NIO, Goa
  • Sahoo, D; Nivedita and Debasish (2001) Seaweeds of Indian coast S. B. Nangia, A. P. H. Publishing Corporation, New Delhi 283 pp Available at - NIO, Goa

Page last updated on:2011-05-04

Back to Search