Ld 
1908] Farlow,— Notes on Fungi,—I 15 
be whether the fungus on Rubi in the Northeastern United States is 
Pucciniastrum articum (Lagh.) 'Tranzschel, of which the uredo was 
first described on Rubus arcticus from Lapland by Lagerheim in 
Hedwigia 28, 109, 1889, and the teleutospores by Tranzschel in 
Script. Bot. Hort. Univ. Imp. Petrop. 4, 300, 302, 1895, from Finland 
and the Ural and on À. saxatilis near St. Petersburg. If not, it is 
certainly a closely related species. Р. arcticum is given by Arthur 
in N. Am. Flora 7, part 2, 107 as occurring on R. stellatus from Alaska 
in its uredo-forin. 
The only American specimen I have seen, which seems to belong 
to the typical P. arcticum is one collected at Grand Manan, N. B., 
on R. triflorus by Prof. К. Miyabe. Of European specimens I have 
examined the no. 857 of Vestergren, Microm. Rar. Select. in which 
the teleutospores are not present. ‘There is nothing in the teleuto- 
spores of the New England fungus which would enable one to dis- 
tinguish them from those described by Tranzschel. His descrip- 
tion is as follows: ''soris teleutosporarum hypophyllis, fuscis, parvis, 
planis. Teleutosporis globosis vel mutua pressione rotundato-cubicis, 
in cellulas 2-4 longitudinaliter divisis, intercellularibus, 19-25 м diam.” 
Newton specimens afforded excellent material of teleutospores. The 
sori are hypophyllous and only slightly raised above the epidermis. 
I have in but one instance seen teleutospores on the upper surface of 
the leaf. The sori vary very much in size, some being very minute 
with not more than a dozen spores, while the diameter of the larger 
sori is often as much as 180 м. The expression, intercellular, as 
applied to species of Pucciniastrum is not altogether clear. In our 
specimens it is not difficult to see that the beginning of a sorus is 
beneath a stoma. 'Тһе mycelium running horizontally in the pali- 
sade-cells buds out and produces an ovoid cell, which soon divides 
into two by a vertical wall and the process is repeated so that, seen 
from above, the spores are arranged in groups of two and fours. 
Other buds are formed from the adjoining mycelium and as the 
mass of the sorus is formed the closing cells of the stoma are torn 
apart and the sorus is then covered only by the compressed adjacent 
epidermal cells. It is not clear whether spores borne in this way can 
be said to be intercellular or not, but it is easy to see the formation of 
sor beneath the stomata beginning with a single spore or pair of 
them. 
If our plant is to be distinguished from P. arcticum it must be by 
