i 9 i6] ROE—COXCEPTACLE IX FUCUS 245 



17. Mitchell. M. O., and Whitting, F. G., On Splachnidium rugosum Grew, 

 the type of a new order of algae. Phyc. Mem. 1:1-10. pis. 1-3. 1892. 



18. Murray, G.,On the cryptostomata of Adenocystis, Alar in, and Sacchorhiza. 

 Phyc. Mem. 2:59-63. pi. 16. 1893. 



19. Oltmanns, F., Beitrage zur Kenntniss der Fucaceen. Cassel. 1889. 



20. — — , Morphologie und Biologie der Algen. Jena. 1905. 



21. Reinke, J., Uber Fucus vesiculosus. Bot. Zeit. 33:463-470. 1875; 

 Nachricht K. Gesells. Wiss. Gottingen. 230-241. 1S75; Jahrb. Wiss. Bot. 

 10:317. 1876. 



22. — — , Beitrage zur Kenntniss der Tange. Jahrb. Wiss. Bot. 10:317- 

 382. 1876. 



23. , Enlwickelungsgeschichte Untersuchungen uber die Dictyotaceen 



des Golfs von Neapel. Nov. Act. Leopold 50:187s. 



24. — — , Atlas deutscher Meeresalgen. Berlin. 1889-1892. 



25. Rostafixski, J. T., Beitrage zur Kenntniss der Tange. I. Leipzig. 1876. 



26. Sachs, J., Lehrbuch der Botanik. Eng. ed. Oxford. 1875 (pp. 226-229). 



27. Simons, E. B., Morphological study of Sargassum filipendula. Bot. Gaz. 

 49:161-182. pis. 10, 11. 1906. 



28. Strasburger, E., Kerntheilung und Befruchtung bei Fucus. Jahrb. 

 Wiss. Bot. 30:351 seq. 1897. 



29. Yaluxte, R., Le Cystoseirae del Golfo di Napoli. Fauna und Flora. 

 Leipzig, pis. i-ij. 1883. 



30. Yamanouchi, S., Mitosis in Fucus. Bot. Gaz. 47:173-197. pis. S-u. 

 1900. 



EXPLANATION OF PLATES XIV-XVII 



The drawings were all made with the aid of the Abbe camera and reduced 

 one-half in reproduction. For figs. 1-18. the original magnification was 1050; 

 for figs. 19-20. the original magnification was 535. Figs. 1-19 are of Funis 

 edentatus; fig. 20 is of Fucus vesiculosus. 



Figs. i ( 7-20<;. — Sketches to show topography. 



Fig. 1. — The inactive segment of the apical cell; the external portion 

 already shows a breaking down ; adjacent cells also show inactivity in a similar 

 way. 



Figs. 2-4. — Further breaking down. 



Fig. 5.— (/') Original segment which has cut off a basal segment; (1 

 original segment with no such segment cut off. 



Figs. 6, 7. — Further stages of figs. 1-3. 



Figs. S-io. Two or more arrested segments. 



Fig. 11. — Further stage of figs. 1-7; basal portions about nuclei very 

 distinct. 



Fig. 12. — Further breaking down; involving of abutting cells especially 

 clear. 



Figs. 13. 14. — Showing how old walls are attached to "central column.'' 



