76 ZYGNEMATACEAE 



Key to the Species of DEBARYA 



I. Zygospore median wall tricarinate 2 



1. Zygospore median wall quadrangular- 

 ovoid 5. D. hardyi 



I. Zygospore median wall globose to 



polyhedric 6. D. polyedrica 



2. Polar surfaces with a distinct "hub" i. D.glyptosperma 



1. Polar surfaces without "hub" 3 



3. Diameter vegetative cells i8m or more 4. D.smithii 



3. Diameter vegetative cells less than i>S/x 4 



4. Polar surfaces obscurely radially 



striate 2. D. costata 



4. Polar surfaces obscurely pitted.... 3. D.ac^leyana 



Descriptions of Species 



1. Debarya glyptosperma (de Bary) Wittrock 1872. Bih. Kgl. 



Sve7isk, Veiensl{. Akad. Handl. 1, p. 35. 



Vegetative cells 10-15 ju, x 40-200 m, with a single, axile, flat, ribbon- 

 like chromatophore with 8 to 12 pyrenoids; conjugation scalariform, 

 tubes very long (up to 80 /a), at first slender and increasing in width 

 until spore is mature; spores formed in the tubes, compressed-ellipsoid 

 or broadly ellipsoid, 30-46 /x x 42-72 /it; median spore wall tricarinate, 

 yellow, with an irregular polar ring of protuberances; radially and dis- 

 tinctly corrugate between the "keels and hubs" when mature. (PI. XII, 

 Figs. 18-19.) 



United States: Reported from New Hampshire, Minnesota, Florida. 



Europe, widely distributed from Wales to Russia and Spain. 



The variety "formosa" Transeau (1915) is an error. 



2. Debarya costata Randhawa 1938. Proc. hidiati Acad. Sci. 



8, p. 121, Fig. 2. 



Vegetative cells 7-11/J- x ioo-150/u, with a single axile ribbonlike 

 chromatophore with 4 to 10 pyrenoids; conjugation scalariform with 

 slender long tubes; zygospores, 36-44 ^ x 38-50/1, compressed-globose to 

 ovoid, tricarinate with clearly defined ridges between the keels; the 

 polar faces of the spores have no "hubs" as in D. glyptosperma but are 

 obscurely and radially corrugate toward the margin. The color is bright 

 yellow, and lateral keels are crinkly. (PI. XII, Figs. 22-23.) 



India, Fyzabad, U.P., December, 1936. 



The specimens sent me by Randhawa contain mature spores, and the 

 above description is based in part on this material. 



