84 PROCEEDINGS OF THE AMERICAN ACADEMY. 



Arthonia, Ach. 



A gregaria, Koerb. Syst. 291 (1855) ; Willey, Synop. of gen. 



Arthonia, 7. Sphaeria gregaria, Weig. Obs. Bot. 43, t. 2, f. 10 (1772). 



— Duncan Isl. : on twigs, May, 1899, Snodgrass & Heller. Cosmo- 

 politan. 



A. nivea, Willey, Synop. of gen. Arthonia, 5 (1890). — Galapagos 

 Ids. : Hassler Exped. [Hill]. Endemic. 



A. platyspeilea, Nyl. Pr. N. Gr. 99 (1863) ; Willey, Synop. of gen. 

 Arthonia, 16. — Galapagos Ids.: Hassler Exped. \_Hill~] ace. to 

 Willey, 1. c. Gardner Isl. : May, 1899, on twigs with Pyrenula cerina, 

 Snodgrass & Heller. Also found in Florida. 



A. sp. Willey, Synop. of gen. Arthonia, 41 (1890). — Galapagos 

 Ids. : Hassler Exped. \_Hill~\ ace. to Willey, 1. c. 



Buellia, De Not. 



B. straminea. Tuck, in herb. — Albemarle Isl.: north of Pt. 

 Christopher, 21 Jan. 1899, Snodgrass & Heller. 



This small specimen of a crustaceous Buellia on a volcanic rock is 

 identical with a large specimen in herb. Tuckerman, Galapagos Ids., 

 Hassler Exped. \_HilV\ which is labelled B. straminea, Tuck., which, 

 however, appears never to have been described. Why it was never 

 jmblished may perhaps be due to the fact that there is another specimen 

 in herb. Tuckerman from the Galapagos Ids., Hassler Exped. \_Hill~\, 

 marked B. Jlavo-areolata, Nyl. and that Tuckerman was in doubt 

 whether B. straminea was distinct from that species. There is, how- 

 ever, no note of Tuckerman stating his opinion. The Snodgrass & 

 Heller lichen agrees perfectly with the specimen of B. straminea. In 

 both the asci are obovate, 32-42 fx by 14-17 //, ; spores fuscous, 2-celled, 

 11 /x by 8-9 fL ; paraphyses hyaline, 2 ju. in diam., branching only at the 

 apex where they end in globose tips, 5 /x in diam., the upper half of 

 which is dark colored. Iodine turns the hymenium blue. The specimen 

 of B. Jlavo-areolata in herb. Tuckerman differs only in having spores 

 rather larger and narrower, those of B. straminea being nearly globose, 

 in which respect it corresponds better with the description of Lecidea 

 flavo-areolatd, Nyl., Ann. Sci. Nat. Bot. ser. 4, iii. 166 (1855). It 

 seems to me probable that the two species are really the same, but in 

 the absence of material to show the variations of the spores, it can only 

 be said that our lichen is certainly B. straminea which differs from B. 

 jlavo-areolata in the shorter and comparatively broader spores. 



