A New Species of Debarya. 
37 
A NEW SPECIES OP DEBARYA. 
By S. Reginald Price, B.A. 
[Plate II.] 
S OME preserved material of a species of Debarya, which exhibited 
certain rather interesting features, recently came under notice 
I submitted a sample to Professor G. S. West, of Birmingham 
University, and he kindly informed me that it was a new species of 
the genus allied to D. desmidioides, West. 1 
The material had been fixed in chrom-acetic acid, and 
transferred to a dilute aqueous solution of glycerine which was 
allowed to concentrate by evaporation. The preservation was 
apparently quite good, so that the measurements (necessarily made 
on this fixed material) should only differ quite negligibly from those 
of fresh material. 
The history of the sample is as follows. The sterile filaments, 
with other Algae, were collected from stagnant ponds on Sheep’s 
Green, Cambridge, by Mr. T. Elborn, and were transferred to the 
algal culture tubs kept outside the Cambridge Botany School. 
Conjugation took place here, and the material was fixed as already 
stated. 
Diagnosis. 
Debarya cruciata sp. nov. Filamentis longis, gracilibus, saepe 
dissociatis in cellulis singulis ; cellulis vegetativis cylindricis, 
lateribus rectis, diametro 10-18 vel rarius 20-plo longioribus 
chromatophoris parvis, cum pyrenoidibus 3-7 in seriam unicam 
dispositis. 
Conjugatio inter singulas cellulas post dissociationem filamen- 
tarum. Zygosporis rotundo-quadratis, lateribus levissime retusis, 
vel rarius convexis, angulis cornutis ; cornibus cylindricis, solidis, 
apicibus rotundis. 
Long. cell. veg. 60-140/a lat. cell. veg. 6-8/a 
Long, zygosp. 28-32/a lat. zygosp. 20-24/a (sine cornibus); 
Long. corn. 8-40/a lat. corn. 8-12/a 
The vegetative cells are remarkably delicate (probably the 
narrowest of the species described for Britain) and relatively long. 
The gametangia are always isolated single cells of the filaments, 
and separated vegetative cells are quite common. The chloroplast 
is relatively short and narrow and contains from three to seven 
1 West, G. S. Journal of Bot., 1903, p. 39. 
