182 ANTHOCEROTACEAE 
marginal tubers, and the shorter somewhat obovate involucres. 
· The spores are yellow, becoming brownish, sparingly warty-gran- 
ulose, 35-45 м; pseudo-elaters mostly of т or 2 elongated genicu- 
late cells. ч 
Anthoceros phymatodes differs from Anthoceros Donnellii Aust, 
in the larger, less numerous tubers on stouter stalks, also in the 
thicker, more opaque thallus, with less distinct surface cells, in the 
longer segments, etc. 
The tubers of А. phymatodes are formed at the apex of the 
costa, but their peduncles become strictly ventral in their attach- 
ment by the continued onward growth of the segment. Two or 
three tubers successively older and larger as one passes backward 
may often be seen depending from a single branch. The tuber 
consists of a cortex of 2—4 layers of nearly empty cells enclosing 
а central mass of smaller cells so densely filled with oil drops or 
nearly colorless granules that the cell boundaries in a section are - 
rendered obscure, 
An interesting paper, “Оп the Structure and Contents of the 
Tubers of Anthoceros tuberosus Taylor" was published in the 
Memoirs and Proceedings of the Manchester [Eng.] Literary and 
Philosophical Society, vol. 41, no. 2 (1896) by Mr. J. H. Ash- 
worth. Mr. Ashworth finds oil-drops and proteid granules in the 
interior cells of the tubers of this species. We have stated (Bull. 
Torr. Bot. Club, 25: 14. 1898) that the granules in the tubers 
of Anthoceros phymatodes, in material preserved in alcohol, show а 
starch reaction with iodine, but further tests upon the same be 
terial either fail entirely to show the starch reaction or show й 50 
obscurely that we must doubt the accuracy of our first observation. 
The granules mostly contain one or two more highly refringent 
portions, as described by Mr. Ashworth in А. tuberosus, and, ой 
the application of iodine, they usually are stained a yellowish- 
brown or remain altogether unaffected. 
PLATES 117 AND 118. ANTHOCEROS PHYMATODES. 
I. Portion-of the thallus, natural size. 
2. Ventral view of a thallus segment, showing costa and tuber, 23. = 
3-6. Lateral views of thallus segments, showing form and stages of developme 
of tubers, ус 24 
7 and 8. Old tubers, showin 
8 vegetative propagation by sprouting, X 23. 
9. Longitudinal section thro 
ugh costa and young tuber, 47 
