RIDDLE: THE LICHENS OF BERMUDA 147 
4. Thelidium Farlowi Riddle, sp. nov. 
Thallus epilithicus, crustaceus tenuis vel tenuissimus con- 
tinuus laevigatus plumbeus, in margine linea obscuriore cinctus. 
Gonidia cystococcoidea. Perithecia partim confluentia, circa 
- 0.5 mm. diam., nigra depresso-hemisphaerica semiimmersa, strato 
tenuissimo thallode fere ad instar pruinae velata, apice sat late 
denudato; amphithecio subgloboso completo, basi tenuiore, fusco- 
nigro. Paraphyses gelatinam percurrentes. Asci 8-spori. Sporae 
incolores, oblongae vel ovales, biloculares, 18-20 X 7-9 u. 
On calcareous rocks, south shore, collected by Professor W. G. 
Farlow, 1881. 
Type in the Cryptogamic Herbarium of Harvard University. 
This species appears to be related to Th. pyrenophorum (Ach.) 
Koerb., but is distinct in the lead-colored thallus and the con- 
fluent perithecia, with the thin thalline covering giving a pruinose 
effect. 
5. PortnaA NucULA Ach. 
On bark of orange, Paynter’s Vale, E. G. B. 363. 
6. PoRINA PHAEA (Ach.) Muell. Arg. 
On Juniperus, Harrington House, Stewardson Brown 560. 
7. PoRINA TETRACERAE (Ach.) Muell. Arg. 
On coffee trees, Walsingham, E. G. B. 293. 
8. PYRENULA AURANTIACA Fée. 
On Rhizophora, Fairy Land, E. G. B. 193; also W. G. Farlow, 
who states that it is generally common on Rhizophora, but higatid 
difficult to cut off. 
9. PYRENULA BRACHYSPERMA Muell. Arg. 
On Eugenia, Hall’s Island, Brown & Britton 885. 
This species was originally published in Mueller-Argau's 
Revisio Lichenum Eschweilerianum, Flora 67: 670. 1884. The 
type came from Brazil. It is exceptional among Pyrenulas in 
having two-celled spores. Although there has been no material 
available for comparison, the Bermuda specimen cs aah ee well 
With the description that there can be no doubt of its identity. 
