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tion of American representatives of the fistulous Ramalinasis unsatisfactory 
and incomprehensible. No. 3 Macoun’s Canadian Lichens of published 
American exsiccati seems to represent the species best, although No. 207 D. 
N. A. Lich. is scarcely inferior. It is probable that Tuckerman would have 
referred both to his R. pusilla, and it is equally certain that both are R. minus- 
cula in Nylander’s sense. The cortex is filamentous rather than amorphous, 
that character being assigned to R. pusilla. The species is usually esoredi- 
ate and to a considerable degree resembles R.fastigiata in miniature. 
Ramalina dilacerata f. pollinariella Arn. in Verh. Zool. Bot. Ges. Wien. 
XLVII (1897) p. 354. 
This is the multifid laciniate form that by most American students is 
referred to var. geniculata Tuckerm. of R. pusilla. Commonly infertile, 
the specimens vary considerably in size, being small on a saxicoline sub- 
strata, and larger with more numerous branches on a corticoline. The 
smaller states, were it not for their being more or less fistulous, might be as 
readily identified as R. farinacea. No. 179 L. B. A. represents the saxico- 
line form. Both the species and variety are northern in range, the species 
having been examined from Nipigon Lake, Cape Breton, Hastings, B. C., 
Victoria, V. I., and Quebec, collected by Prof. J. Macoun; Newfoundland, 
Waghorne; while the variety comes to notice from Sable Island, Murray 
River, Que. , Cape Breton, the Gaspe Country, Anticosta, J. Macoun; and St. 
Paul’s Island, Bering Sea and Unalaska, J. M. Macoun; Maine and New 
Hampshire, Merrill. 
Ramalina inflata Hook. fil. et Tayl. Antarct. I, p. 194. 
Var. soredians Merrill var. nov. me. KHO — 
Agreeing with the species except that the laciniae laterally and some- 
times apically show a tendency to fissure, when the perforation becomes 
more or lessbircuiar, the inner wall of the podetia-like branch becomes visi- 
ble through the perforation and all the exposed surface takes on a farinose 
aspect. Collected in Jamaica by the late Miss C. E. Cummings. 
Ramalina rigida (Pers.) Nyl. Mon. Ram. p. 14. 
Lichen rigidus Pers. in litt. 
Physcia attenuata Pers. in Act. Societ. Wetterau. II. PI. 10, s. 7, me. 
KHO+ 
Persoon’s illustration of Physcia attenuata is sufficiently like R. grad- 
ient a (Ach.) Nyl. but Nylander considers that it represents R. rigida , or at 
least his conception of it. Nylander distinguishes those closely allied forms of 
the R. rigida group in this manner. R. rigida is at once separated by the 
reaction with hydrate of potash me. KHO-(- yellow, at length red. The 
plant grows in a fruticulose manner , and the laciniae are terete or terete- 
compressed, the cortex smooth. Spores 10-15 X 7-8/q straight, ellipsoid or 
oblong-ellipsoid. R. gracilis is characterized by lotigitudinally striate , 
sub-costate, angulose laciniae, caespitose habit, and larger spores, these 
being 11-21 X 7~9/b straight, ellipsoid, or oblong or fusiform-ellipsoid, and 
lack of reaction with hydrate of potash. R. gracilenta differs from R. 
gracilis to which it is very closely allied in having slightly shorter and nar- 
