CHAPTER TWELVE 



THE GENUS ENTRANSIA ELWYN HUGHES 1943 



The genus Entransia was established to classify an alga having 

 simple filaments with cylindrical cells and one or two laminate 

 parietal chromatophores extending lengthwise of the cell, with 

 several irregular fingerlike processes extending outward and part 

 way around the cell. Each chromatophore has several scattered 

 pyrenoids. In young cells with a single chromatophore the nucleus 

 is laterally placed near the center of the chromatophore. In mature 

 cells the nucleus is in the bridge between the two chromatophores. 

 The orientation of the two chromatophores with the nucleus be- 

 tween, the scattered pyrenoids, and the fingerlike processes extend- 

 ing outward and more or less enclosing the cell contents suggest 

 that the plant may belong to the Zygnemataceae. On the other 

 hand it may belong to the Ulotrichaceae near the genus Ulothrix. 

 Until the reproductive structures are found no definite disposition 

 of the genus can be made. Named for E. N. Transeau. 



Description of Species 



Entransia fimbriata Hughes 1943. Abstracts of Doctoral Disser- 

 tations, The Ohio State University, 40, pp. 153-59; also in 

 Amer. Jour. Bot., 35 (1948), p. 487. 



Filaments with cylindrical vegetative cells 19-22.4 ft x 16-64 /a; i or 

 2 parietal chromatophores extending lengthwise of the cell, each with 

 several lateral processes partly embracing the cell contents. There is a 

 nucleus, in young cells located laterally and near the center of the 

 chromatophore; in mature cells with 2 chromatophores the nucleus is 

 in the bridge between them. (PL XX, Fig. 15.) 



Canada, Nova Scotia, Queens County, Charleston, July, 1941. Collected 

 in a small artificial lake in the Port Medway River valley. 



Here is an interesting note. In this same lake Hughes collected 3 new 

 species of Bulbochaete, i new Oedogonium, and a new Spirogyra. These 

 were the only new species of filamentous algae found on the peninsula 

 during two summer collecting trips, and in the examination of numerous 

 collections made by other residents of Nova Scotia. Many other collectors 

 have had similar experiences of finding one station that contained several 

 new or rare species not met with elsewhere in the same region during a 

 collecting period of several years. 



