7 
/ 
spore-membrane, by which it is also distinguished from the other 
species of the acuminata group. These specimens show a varia- 
tion in the character of the leaves of a verticil; they are frequently 
dimorphous, but never heterophylious as in J. clavata A. Br. of 
the Pacific coast. 
A similar heteromorphous character of the leaves (some simple 
and sterile, others branched and fertile) may also be found in 
Nitella Blankinshpii (found in the same region), and it has 
seemed possible that some transitional forms leading toward JV. 
clavata A. Br. would be found, especially as in both of these 
species we find a tendency to an inflation of the terminals so com- 
monly a character of clavata. But the difference between hetero- 
morpha and true heterophylla is constant and fundamental in 
the development of the nodal cells, rather than accidental and 
variable. | 
Explanation of Plate 253. 
Fig. 1, plant natural size; fig. 3, stem verticil and- leaf 25; figs. 3 and 4, leaf 
nodes with terminals 25, fig. 5, nature spore <52- 
Contributions to the Lichens of Maine.—ll. 
By F, L. HARVEY. 
The following list embraces lichens collected last August in the 
vicinity of Jackman and about Orono by the writer ; about Bangor 
by Mr. O. W. Knight; at N. Lubec and in Aroostook Co., by 
Miss Cummings and Miss Teller. Miss Cummings’ specimens 
were principally from the head waters of the St. John and were 
distributed in « Decades of N. A. Lichens.” The Jackman speci-— 
mens were from the headwaters of Penobscot, Kennebec and De 
Loup rivers. Sandy Bay Mt. mentioned in the list is 12 miles 
northeast from Jackman and on the Canadian boundary. The | 
numbers above 115 are accessions to the State flora. Those be-  ~ 
low 115 refer to new localities for species mentioned in a pre- . 
vious list (BULLETIN, September, 1894. +389). We are under do 
ligation to Miss Cummings for the examination | of ecim 
