The Morphology of Phylloglossum Drummondii, Kunze. 
BY 
K. SAMPSON, B.Sc., 
Post-graduate Student , Royal Holloway College , University of London. 
With five Figures in the Text. 
Contents. 
PAGE 
I. Introduction . . . .315 
II. Macroscopic Structure . .316 
III. General Morphology of the 
Tuber ..... 318 
IV. Vascular Anatomy of Fertile 
Plants 318 
(a) Stelar Anatomy of a large 
Fertile Plant . . .318 
PAGE 
(/;) Origin, Course, and Form of 
the Tuber Stele in Fertile 
Plants .... 
3 32 
(V) Leaves connected with the 
New Tuber 
326 
V. 
Vascular Anatomy of Sterile 
Plants 
327 
VI. 
Branching in Phylloglossum 
328 
VII. 
Conclusion .... 
330 
VIII. 
Summary 
33 i 
I. Introduction. 
JpHYLLOGLOSSUM Drummondii was described for the first time in 
1843 by Kunze, who regarded the genus as occupying a position 
intermediate between the Lycopodiaceae and the Ophioglossaceae, its 
supposed affinity with the latter family being founded on a superficial 
resemblance in habit to Ophioglossum Bergianiuni} The following year 
Roeper associated P/iylloglossum with the Lycopodiaceae, and in that 
family it has been placed by all later writers. 2 
While the anatomy and general structure have been dealt with by 
Mettenius, 3 Bertrand, 4 and Bower, 5 no satisfactory conclusion has been 
reached in regard to the morphology of its annual tuber. Mettenius com- 
pared the yearly tuber with that of Orchis and the dropper of Tulipa , but, 
on the ground that these organs are structurally different, he maintained 
that the comparison was of little use. Bertrand described the anatomy 
of Phylloglossum in great detail, but he left the problem of the morphology 
of its tuber unsolved. Bower followed Treub in comparing the yearly 
1 Kunze : Bot. Zeit., 1843. 2 Roeper: Zur Flora Mecklenburgs, ii, 1844. 
3 Mettenius : Bot. Zeit., 1867. 
4 Bertrand : Areh. bot. du Nord de la France, Nos. 30-34, 1884. 
5 Bower : Phil. Trans., 1886. 
[Annals of Botany, Vol. XXX. No. CXVIII. April, 1916.] 
