186 



FHESH-WATER ALG.E FROM BURMA. 



Forma paullo minor; crass, cell, veget. 17/*; long, zygosp. 44-50/*; lat. zygosp. 25/*. 



JIab.— In springs on the river bank at Bhamo (No. 21501). 



17. Spirogyra exilis sp. n. (PI. x, figs. 11-13). 



S. cellulis vegetativis diametro l|-4-plo longioribus, extremitatibus non replicatis; 



chromatophoris 2, crassis, marginibus irregularibus, anfractibus lj|~2; conjugatione 



scalariformi, cellulis fructiferis non inflatis, sed cellulis vegetativis inter cellulas fructiferas 

 multe inflatis; zygospoiis oblongis cum polis valde rotundatis, nonnunquam paullo 

 irregularibus, cellulas fructiferas psene complentibus. 



Crass, cell, veget. 27-30/t ; crass, cell, inflat. inter cell, fruct. 47-49/*; long. 





zygosp. 36-45/i ; lat. zygosp. 27-30/*. 



JIab. — In shallow pools, Singaing in Kyaukse district (No. 22193). 



The most remarkable feature of this Spiroayra is the great inflation of those cells of the 

 female filament which have not succeeded in conjugating. Sometimes these sterile, inflated cells 

 alternate with l h& female gametangia throughout the entire length of the conjugating filaments. 



S. exilis should be compared with 8. decitnina, from which it is easily distinguished by its 

 narrower filaments, thicker chloroplasts, and its oblong zygospores* 



■ 



18. Spirogyra longata (Vouch.) Wittr. Gotl. 01. sotv. Alg. 1872, p. 45; Petit, 



Spirogyra Envir, Pari?, 1880, p. 20, t. 5, f. 4, 5. 



Conjugata longata Vauch. 



Zygnema longatum Hass. 

 Crass, cell, veget. 31-32/,; long, zygosp. 49-51,*; lat. zygosp. 28-5-31/*. 

 JIab — Near the river at Bhamo (No. 21503). 



19. Spirogyra okikntalis sp. n. (PI. x, figs. 9, 10). 



S. cellulis vegetativis diametro 3-5|-plo longioribus, extremitatibus non re_ 

 catis; chromotaphoris 3, angustis, laxis, marginibus subintegris sed paullo irregulari 

 bus, anfractibus 1-1 1; conjugatione scalariformi, cellulis fructiferis multe inflatis; 

 zygosporis ellipticis, diametro dicker lj-plo longioribus, polis leviter obtuse conicis, 

 cellulas fructiferas non complentibus ; lamina mediana zygospore minute scrobiculata. 



Crass, cell, veget. 30-3)/*; crass, cell, fructif. 57-65/*. long, zygosp. 61-5-67/*; 

 lat. zygosp. 38-i2/i. , 



JIab.— In springs on the river bank at Bhamo (No. 21501). 



The greatly-inaated female gametangia of this species are very characteristic. It somewhat 

 resembles S. decimina, from which it differs in its narrower filaments and in its inHated 



fructiferous cells. 



20. Spirogyra decimina (Mull.) Kiitz. Phyc. germ. 1845, p. 223; Rabenh. Flor. 



Europ. Alg. iii, 1868, p. 2422; Petit, Spirogyra Envir. Paris, 1880, 

 p. 25, t. 8, f. 1-3. ' ' 



Forma cellulis vegetativis et zygosporis paullo majoribus quam in forma typica 



chromatophoris plerumque 3. 



Crass, cell, veget. 42-46/*; long, zygosp. 73-92/*; lat. zygosp. 42 



* 



46 



/W.-Kyauktaga iu the Pegu district (No. 22124). Also Singaing in the 



Kyaukw district (No. 22193). 







