MYRIANGIUM. 



261 



into ragged extensions as in UmUlicaria erosa, and U. Muhlen- 

 bergiij the disk of attachment, in short the whole under side of 

 Omphalodium, with not a little of the general habit of the 

 lichens brought together in it, is sufficiently significant of an 

 Umbilicarieine rather than Parmelieine affinity. 



P. 161, after L. pulchtllum, add L. hypotrachynum, Mull. 

 Lich. Beitr. in Flora, 1881, n. 6, Mexico, on trunks, Sumichrast ; 

 with a specimen of which I have been favoured by the author : 

 but I cannot well separate it from the species first-named. 



P. 229, after Gyrostomum, would correspond to the place 

 chosen, for lack of a better, in the author's Genera Lichenum, for 

 a plant of obscure affinity which is often taken for a lichen, and 

 has not yet found any other place. 



MYRIANGIUM, Mont. & Berk. 



Apothecia lecanoroid j multilocular each cell containing 

 a single theke j paraphyses deficient. Spores in 8 s , oblong- 

 ovoid ; Bub-muriform ; commonly without colour. Spermo- 

 goues deficient. Thallus wholly cellulose orbiculate, with 

 something of the aspect of some Omphalarice, and the cir- 

 cumference becoming plicate-striate and effigurate; but 

 friable ; and gouiinous cells deficient. 



M. Duritfi (Mont. & Berk.) Tuckerm. ; thallus apparently 

 crustaceous-adnate, but the at length sub-lobulate circumference 

 free j from dark-brown blackening, dull ; apothecia at length a 

 little elevated ; of the colour of the thallus; the flat disk bordered 

 by a stout but depressed, very entire margin. Spores ^p mic. 

 Gen. Lich. p. 140. M. Duricei, & M. Curtisii, Mont. & Berk. 

 in Mont. Syll. p. 380. Nyl. Syn. 1, p. 139, t. 4, /. 1-5. 



Upon trees. North and South Carolina, M. A. Curtis-, Rav- 

 enel. Alabama, Beaumont. And no less in Cuba, Wright ; and 

 New Granada, Lindig. It occurs also at the north ; in Massa- 

 chusetts, Sprague ; Connecticut, Wright ; Khode Island, Bennett ; 

 Pennsylvania, Michener. 



