198 



■ 



FRESH -WATER ALG^E FROM BURMA. 



67. Euastrum coralloides Josh. Burmese Desm. 1886, p. 639, t. 23, f. 10. 



Var. subintegrum var. n. (PL xiv, fig. 8). 



Var. minus, lobo polari paullo angustiori integro ad margines laterales, incisura 

 apicali perangusta et minus profunda, angulis superioribus lobi polaris 

 unidenticulatis, tumoribus basalibus tribus. 



Long. 24-5,; lat. 21,; lat. lob. polar. 15/*; lat. isthm. 5'5, ; crass. 13,. 

 JIab. — Mansang, near Hsipaw (No. 24193). 



This variety agrees with var. trigibberum Lagerh. (Desm. aus Bengal, 1888, p. 6) in the 

 poiBoesion of three basal protuberances on each semicell. It resembles E» pfesiocoraltoides W. & Gk 

 8. West, iu the nature and disposition of its protuberances, but the apex of the polar lobe is 

 truncate, the incisions below the polar lobe are small open notches, and the lateral lobes are more 

 projecting and quadrate. 



TVe are inclined to believe that the var. trigibberum Lagerh. may possibly be the same plant as 

 Joshua had in view when he originally described his E. coralloides. He describes and figures only 

 two basal tumours, whereas all the Euastra of this nature have one central one and generally two 

 lateral ones, and as we have found his figures and descriptions to be inaccurate with regard to the disposi- 

 tion of the tumours on other species, we think this may also be the case in E. coralloides. This 

 view is further supported by the fact that Borge (Trop. u. subtrop. Sussw.-Chlor. 1899, p. 26, t. 2, 

 ! . 31), figures three basal tumours on specimens of E. coralloides which he examined from Singapore. 



68. Euastrum pulchereimum W. & G. S. West, Freshw. Alg. Ceylon, 1902, 



p. 153, t. 20, f. 11. 



Var. divisum var. n. (PL xiv, fig. 



Var. paullo minus, lobis lateralibus leviter bilobulatis, lobulis inferioribus retuso- 

 emarginatis, denticulos marginales carentibus, tumore centrali semicellularum 

 granulis 4 praedito. 



Long. 44,; lat. 29'5/»; lat. isthm. 9*4,; crass. 17-5^. 

 Hah.— Mansang, near Hsipaw (No. 24193). 



Th 



variety differs principally in its bilobulate lateral lobes and in the absence of the 



teeth along the lateral margins. The central tumour is furnished 



within the lateral and polar lobes are also quadrigranulate. 



tumours 



and the 



69. Euastrum dubium Nag. Gatt. einz. Alg. 1849, p. 122, t. 7D, f. 2. 



f. 4. 



B. lobuhtum Bre"b. Liste Desm. 1856, p. 124, t. 



E erosum Lund. var. notabile West, Alg. Eng. Lake District, 1892, p. 723, 

 t. 9, f. 17. " r 



Var. tritum var. n. (PI. xiv, fi g . 6 ). 



Var. paullo minus, lobis lateralibus minus prominentibus, angulis lobi polaris 

 rotundatxs, incisura apicali variabili ; meinbrana glabra. 

 Long. 22-26,; l at . 13-14-5,; lat. apic. circiter 8-9, ; lat. isthm. 3-8-4-4, : 



crass. 8*5, 



Hob 



In the Kan-gyi at Mudon (No. 24505) 



rounded 6 polar lobe" Tbf "Lif^ii ^ 'T* f !t dubium * being less P^miuently lobed, and in its 

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