•Riddle: Lichens Collected in Jamaica 135 



69. Erioderma sp. Cummings no. 42 evidently belongs to this 



genus and to a different species from either of those given 

 above, but it is sterile and too immature for certain de- 

 termination. 



70. CoccocARPiA PELLiTA (Ach.) Mucll. Arg. Flora 65: 320. 



1882. Pannaria molyhdea (Pers.) Tuck. Gen. Lich. 52. 

 1872. Cummings no. 143; also no. 160, which approaches 

 var. cronia (Tuck.) Muell. Issued in Merrill's Lich. 

 Exsic. no. 114. 



(Note. — The tropical species of Lobaria and Sticta are much 

 in need of monographic revision. In the absence of such a treat- 

 ment I can do no more than give the results of a careful com- 

 parison of the specimens with the material in the Tuckerman 

 herbarium.) 



71. Lobaria corrosa (Ach.) Wainio (1890) i: 200. Sticta 



dissecta var. corrosa (Ach.) Tuck. Syn. N. A. L. i : 93. 

 1882. Cummings no. 21. Issued in Merrill's Lich. 

 Exsic. no. 42. 



72. Lobaria pallida (Hook.) comb. nov. 6^hV^a Hook, in Kunth : 



Syn. plant, quas in itin. ad plag. aequinoct. orb. novi 

 colleg. Humboldt & Bonpland i : 29. 1822. Cummings 

 no. 23. 



73. Lobaria PELTiGERA (Delise) Wainio (1890) i: 199. Sticta 



dissecta Ach. and many authors. The material bearing 

 this name in the Tuckerman herbarium varies very greatly, 

 and it seems scarcely possible that it can all be one species. 



(a) Cummings no. 24 is the smooth, polished form 

 with very regular and beautiful sinuate lobing. It agrees 

 best with the specimen in Wainio's Lich. Brasil. Exsic. 

 no. 378. It also agrees with the type specimens of Sticta 

 Fendleri Mont. & Tuck., which Tuckerman seems to 

 have considered to be a synonym. 



{b) Cummings no. 20 is an even, dull form with short 

 rather irregular lobes. It agrees with material from 

 Jamaica collected by J. Hart. 



(c) Cummings no. 18 is the minutely pitted form with 



