ANTHOCEROS 181 
privilege of examining through the kindness of Professor Massa- 
longo, as well as specimens from Portugal and Italy, obligingly 
communicated by Herr Stephani. But A. dichotomus has a costa 
М-М the width of the segment, 6-10 cells thick, the lamina 
mostly 2-stratose, involucre .7-1 mm. wide, often enlarged at the 
irregularly 2-4-lobed mouth; while A. phymatodes has a costa 
3-і the width of the segment, 10-16 cells thick, the marginal 
lamina 5—3-stratose, involucre .5-.6 mm. wide, not expanded at the 
entire or repand mouth. To facilitate further comparison, when 
the mature sporogonia are found, it may be added that in А. dicho- 
tomus from Raddi's herbarium (** Anthoceros polymorphus Када y ` 
dichotomus Raddi ” is the legend the packet bears) the capsules are 
erect or slightly curved, 7.5-15 mm. long, often thickened toward 
the apex, spores yellow, becoming yellowish-brown, rounded- 
tetrahedral, almost wholly smooth on all faces, 42—60 и in maxi- 
mum diameter, pseudo-elaters yellowish, of 1—4 irregular elongated 
cells, geniculate, variously contorted, often branched. 
Anthoceros caespiticius DeNot., the probable original of which 
(from the vicinity of Cagliari, in southern Sardinia), we have been 
allowed to study through the indulgence of Professor Pirotta, is not 
closely related to А. dichotomus, with which it was compared by 
its author. It is a near ally of Anthoceros punctatus and may not 
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 и in maximum diameter. e 
pseudo-elaters are practically as in 4. punctatus. The involucres 
measure .65—1.1 mm. x -25—.5 mm. It is surely very different 
from the Californian plant, even though mature spores of the latter 
аге wanting. The thallus apparently bears no tubers ; it is thinner 
than in A, phymatodes, is quite indistinctly costate, and has the pe- 
culiar narrow ascending marginal shoots of A. punctatus. It is de- 
scribed by DeNotaris as being erect, while А. piymatodes is pros- 
trate. 
Anthoceros tuberosus 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 
