Butters: OBSERVATIONS ON RHODYMENIA. 213 



BIBLIOGRAPHY. 



Greville, R. K. Alg. 1830. 



Montague, C. Crypt. Brasil. in Ann. Sci. Nat. Bot. II. 12: 42- 



55- lS 39- 



Postels A. and Ruprecht, F. J. Illust. Algar. 20. pf. j6. 1840. 

 Kiitzing, F. T. Spec. Algar. 693, 778-784. 1849. 



(1) Agardh, J. G. Alg. Med. et Adriat. 1842. 



(2) Agardh, J. G. Alg. Liebm. 



(3) Agardh, J. G. Spec. Gen. et Ord. Algar. 2: 374-383. 1852. 



(4) Agardh, J. G. Epicr. syst. Florid. 324, 329. 1876. 

 Harvey, W. H. Ner. Bor.-Am. 2: 147, 148. 1853. 



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Kjellman, F. R. Alg. Arctic Sea. 150, 151. 1883. 



Ardissone, F., Phyc. Med. i: 212-215. I ^3- 



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DESCRIPTION OF PLATE XX. 



1. Mature plant showing perforations, proliferations and cysto- 

 carps. x \. 



2. Cross section of frond. Med. medullary area, cor. cortical 

 area, x 1 12. 



3. Longitudinal section of central area of frond, showing pits in the 

 walls, x 132. 



5. Surface view of frond, showing irregular arrangement of surface 

 cells. Stained with fuchsin. X335. 



5. Cross section of stipe. Drawn with camera lucida. X4O. 



6. Tetraspores ? X335. 



7. Cross section of mature cystocarp (not cut through carpostome) 

 showing placentation and general structure of the spore mass. The 

 upper part of the spore mass is somewhat scattered. Only the spores 

 have their contents filled in. X39 



8. Peculiarly branched and interwoven filaments from the base of a 

 cystocarp. x 237. 



9. Gonimoblast filaments stained one minute in iodine in potassium 

 iodide, x 237. 



10. ii. Gonimoblast filaments, contents not drawn. X237. 



12. Young cystocarp showing carpostome and early stage in the 

 development of spore mass. Contents have been omitted except from 

 sporogenous cells. Di'awn with Camera lucida. x 230. 



