(140 ) 
XXXVI.—GYROSTOMUM, Fr. 
Fr. S$. 0. V. p. 268. Nyl. in Prodr. Fl. N. Gran. p.51; Syn. Lich. N. Caled. 
p. 39. Gymnotrema, Nyl. Enum. Gén.1.c.p.119. Thelotrematis? sp., 
Fée Ess. p. 95. Mont. Guy. p. 55. Volvaria sp., Stizenb. Beitr. 1. c. 
p. 168. Lecidex sp., Ach. Syn. p. 27. 
Apothecia ex urceolato explanata, orbicularia 1. elongato-diffor- 
mia; excipulo proprio atro, margine integro; thallino demum dis- 
parente. Spore ellipsoidee, muriformi-pluriloculares, fuscescentes. 
Spermatia haud visa. Thallus crustaceus, uniformis. 
G. scyphuliferum (Ach.) Fr., the type of the genus, remains the only 
species; and presents a (supposed) modification of the Urceolarieine pat- 
tern approaching, perhaps too closely, to some modifications of Graphis. 
With this singularly aberrant exhibition of the final degradation of 
the Parmeliaceous apothecium, occurring here in the low country of 
South Carolina (Afr. Ravenel) in Florida (Mr. Beaumont) in Louisiana 
(Hale) and in southern Texas (A[r. Ravenel) the reckoning of the members 
of the present tribe is completed. 
APPENDIX. 
MYRIANGIUM, Mont. & Berk. 
Mont. & Berk. in Hook. Lond. Journ. Bot. 4, p. 72.’ Mont. Pl. Cell. cent. 
6, in Ann. Sci. Nat. 3, 10, p. 245; Syll. p. 380. Mass. Symm. p. 97. 
Nyl. Prodr. p. 27; Syn. 1, p. 189; in Prodr. Fl. N. Gran. p. 4. Stizenb. 
Beitr. 1. c. p. 142. 
Apothecia lecanoroidea, multilocularia, loculo singulo thecam 
singulam fovente, paraphysibus nullis. Spore oblongo -ovoideer, 
sub-muriformes, incolores. Thallus frondoso-orbiculatus, friabilis, 
totus cellulosus, ambitu plicato-striatus effiguratusve, absque 
gonidiis. 
Not even as the most abnormal type (‘le genre le plus anormal’) does 
it appear possible to agree with Montagne in associating this plant with 
the Collemei. Admitting, in certain specimens, a resemblance in habit to 
some Omphalarie, as perhaps to Thyrea Notarisii, Mass. Lich. Ital. 
n. 174, what we have here before us is a cryptogam in which the very 
element of structure upon which all the essential differences of Collemei 
hang, is deficient. And the difficulties (Nyl. ll. cc.) are scarcely less in 
finding a place for it among other Lichens. It is appended here there- 
