Riddle: Lichens Collected in Jamaica 133 



52. Stereocaulon cornutum Muell. Arg. Flora 69: 252. 1886. 



Cummings no. 11. Issued in Merrill's Lich. Exsic. no. 

 121 as vS. pityrisans Nyl. Whether or not these two 

 names are synonyms is a point that can be settled only by 

 a study of the type specimens. 



53. Stereocaulon ramulosum (Sw.) Ach. Meth. 314. 1803. 



Cummings nos. 9, 10, and 12 may all be placed here pro- 

 visionally, awaiting the completion of a monographic 

 revision of the genus now in progress. 



54. DiCHODiuM BYRSiNUM (Ach.) Nyl. Lich. Nov. Zeland. 9. 



1888. Physma byrsaeum (Afzel.) Tuck. Syn. N. A. L. 

 i: 115. 1882. Cummings no. 45. 



55. Leptogium bullatum (Ach.) Nyl. Syn. i: 129. 1858. 



Cummings no. 56. 



56. Leptogium chloromelum (Sw.) Nyl. Syn. i: 128. 1858. 



Cummings no. 67. This is scarcely typical, but agrees 

 with some of the material so named in the Tuckerman 

 herbarium. 



57. Leptogium marginellum (Sw.) Mont, apud Ramon de la 



Sagra: Hist, physique Cuba i: 115. 1838-1842. Cum- 

 mings no. 68. Issued in Merrill's Lich. Exsic. no. 86. 



58. Leptogium lacerum (Sw.) S. F. Gray, Nat. Arr. Brit. PI. 



i: 401. 1821. Cummings no. 60. This is sterile but 

 agrees with material in the Tuckerman herbarium. 



59. Leptogium phyllocarpum (Pers.) Nyl. Syn. i: 130. 1858. 



Cummings no. 59. 



60. Leptogium punctulatum Nyl. Lich. Mexican, i. 1872. 



Cummings no. 64. This has been compared with the 

 material so named in Wainio's Lich. Brasil. Exsic. no. 

 380, from which it differs only in the thallus being more 

 lacerate. But the spores are considerably larger than the 

 measurements given by Wainio, being 33 X 10 instead 

 of a maximum of 28 X 5 1^, and the material may prove 

 to be distinct. 



