FLORA OF THE GALAPAGOS ISLANDS. 87 
Rinopina, Mass. 
R. MAMILLANA, Tuck. Proc. Am. Acad. vii. 226 (1866), & xii. 174. — 
GaLapacos Ips.: Hassler Exp. [Hili]. Further distrib. Oahu, 
Hawaiian Ids. 
Roccetia, DC. 
The most striking feature of the maritime lichen flora of the 
Galapagos Islands as well as of the west coast of America from 
California southward is the abundance of species of Roccel/a of which 
very fine specimens were collected by Messrs. Snodgrass & Heller. 
In most herbaria the Roccellae of this region are somewhat vaguely 
placed under the species &. fuciformis and R. tinctoria, the com- 
planate forms being referred to the former and the more or less terete 
forms to the latter. The excellent Monographia Roccelleorum of 
Darbishire, Stuttgart, 1898, affords the means of a more satisfactory 
determination. The separation of Dendrographa and Roccellaria from 
occella on the structure of the cortex is well founde th 
specimens of this group collected by Messrs. Snodgrass & Heller belong 
to the genus Roccella proper. 
R. pervensis, Darb. Bull. Herb. Boiss. v. 763 (1897), & Monogr. 
Roce. 47, t. 18, 19, f. 83-88 (1898). R. Montagnei, var. peruensis. 
Kremph. Verh. Zodl. Bot. Gesell. Wien, xxvi. 443 (1876). 2B. fuci- 
jormis, ©. Cummings in Rob. & Greenm. (1), 149, not Ach. — 
ALBEMARLE Isxt.: Baur. Barrineton Ist.: Snodgrass & Heller. 
Cuartes Isu.: Baur. Cnatuam Isz.: Snodgrass & Heller. Dun- 
Hoop Isu.: Baur; Snodgrass & Heller. Tower Ist.: Snodgrass & 
Heller, A considerable number of specimens were collected, none, how- 
ever, with apothecia. The yellow basal filaments described by Darbi- 
shire are present in this species, which grows on shrubs. The specimens 
are larger and broader than the figures of this species in Darbishire: 
and some resemble more closely his figure of R. portentosa, t. 8, f. 32. 
It may be questioned whether that figure really belongs to R. portentosa. 
In all specimens having this habit there were present the yellow base an 
lignicolous habitat which indicate R. peruensis. 
R. portentosa, Darb. Ber. Deutsch. Bot. Gesell. xv. 4 (1897), & 
Monogr. Roce. 29, t. 7-11, f.27-41 (1898). R. tinctoria, var. portentosa, 
Mont. in Gay, Pl. Chili, viii. 841 (1852). — Barrineton Ist.: May, 
1899, Snodgrass & Heller. Garpner Ist.: May, 1899, Snodgrass & 
