1922] BLOMQUIST—ANGIOPTERIS 199 
9. GWYNNE-VAUGHAN, D. T., On the anatomy of Archangio pteris Henryi and 
other Marattiaceae. Ann. Botany 19:259-271. 1905. 
10. Hote, J. G., Vegetationsorgane der Marattiaceen. Bot. Zeit. 34:215. 1876. 
11. Lanp, W. J. G., The embryology of Angiopteris evecta (unpublished). 
12. SHOVE, Miss R. F., On the structure of fey stem of Angiopteris evecta. 
Ann. Botany 14:497-525. pls. 28, 29 
13. West, C. A., A contribution to he ae of the Marattiaceae. Ann. 
Botany 31: ehcdks. IQI7. 
EXPLANATION OF PLATES V-VIII 
PLATE V 
Fic. 9.—Model of stelar structure represented in fig. , 73, first, 
second, and third root steles; /;, /2, /;, first, second, and thied ey aes: cs, 
commissural strand; /g, leaf gap. 
Fic. 10.—Same model viewed from above. 
Fic. 11.—Model of stelar structure represented in diagram in fig. 4 
Fic. 12.—Same model viewed from above: ms,, first medullary strand. 
Fic. 13.—Model of stelar arrangement represented in fig. 5; abbreviations 
same as above. 
Fic. 14.—Same model viewed from opposite side. 
Fic. 15.—Same model viewed from above. 
PLATE VI 
Fic. 16.—Detail of a diarch primary root: en, endodermis; ph, phloem; 
in, tannin cell; pc, pericycle; x 
Fic. 17.—Detail of triarch primary root; X33 
Fic. 18.—Apical cell at stem tip: e iy ica, X 330. 
Fic. 19.—Detail of transition region; 30. 
Fic. 20.—Section of sporeling: rtz, Me of second root; /;, first leaf 
trace; 330. 
PLATE VII 
Fic. 21.—Detail of central region on level of outgoing of fourth leaf trace: 
¢, central strand; rt, fifth root stele; cs, commissural strand; ph, phloem; 
mc, mucilage canal; 170 
IG. 22 a Debad of snediliaey strand: ph, phloem; X33 
Fic. 23.—Meristematic region terminating main Rieck nd: X 180. 
Fic. 24.—Detail of stipular strand; 330 
Fic. 25.—Detail of stele above transition region showing medullated 
condition; rf, second root trace; 330. 
PLATE VIII 
Fics. 26-33.—Diagrams of sections of stipular region nigh advanced stage 
showing roars and inter-relation of vascular strands; 
Fic. 34.—Reconstruction of sections: mr, meristematic sci of stipule; 
eimiele is slightly larger than sections to show better the courses 
of strands. 
