﻿14 Howe: The Anthocekotaceae 



be specifically distinct. The spores incline to be fuscous and are 

 finely setose- papillate on the outer face and foveolate-reticulate 

 on the inner faces ; they are 40-45 ji in maximum diameter. The 

 pseudo-elaters are practically as in A. pnnctatus. The involucres 

 measure .65-1.1 X .25-. 5 mm. It is surely very different from the 

 Californian plant, even though mature spores of the latter are want- 

 ing. The thallus apparently bears no tubers; it is thinner than 

 in A. phymatodes ,\s quite indistinctly costate, and has the peculiar 

 narrow ascending marginal shoots of A. pnnctatus. It is described 

 by DeNotaris as being erect, while A. phymatodes is prostrate. 



Ant/ioceros tnberosus Tayl., from Swan River, Australia (Drum- 

 mond, 1873), we have examined through the courtesy of Dr. B* 

 L. Robinson, Curator of the Gray Herbarium, in which the Tay- 

 lor collection is incorporated. It differs from our plant in the 

 much thinner, broader, scarcely costate thallus, the terminal or 

 marginal tubers, and the shorter somewhat obovate involucres. 

 The spores are yellow, becoming brownish, sparingly warty-gran- 



ulose, 35-45 l l \ pseudo-elaters mostly of 1 or 2 elongated genicu- 

 late cells. 



Anthoccros phymatodes differs from A. Donnellii Aust. in the 

 larger, less numerous tubers on stouter stalks, as indicated more 

 definitely in our descriptions and in the key to the species, also 

 in the thicker, more opaque thallus, with less distinct surface cells, 

 in the longer segments, etc. 



The tubers of A. 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 

 a central mass of smaller cells so densely filled with oil drops or 

 whitish granules that the cell boundaries in a section are rendered 

 obscure. The whitish granules in alcoholic material show a starch 

 reaction with iodine. 



6. Anthoceros Donnellii Aust. Bull. Torr. Bot. Club, 6 : 304. 



1879. 



Thallus small, smooth, rather thin, substellately dissected, the 

 segments irregular in form, somewhat overlapping and intertang- 



