ENDOCARPE.E. 27 



Fries, Licb. Europ. 419, ays that this genus is 

 distinguished " nucleis omnino nudis (nulla membrana 

 cinctis)." But this is assuredly incorrect, inasmuch as 

 the nucleus is enclosed in a distinct, tough, persistent, 

 membranaceous, somewhat waxy tunic, very distinguish- 

 able even in a dry state. 



Fee figures the sporidia of foreign species as having 

 the margin striated in a radiant manner; but in our 

 British species this appearance, though frequently seen, 

 is not real but illusory, arising from the entangled 

 floccose paraphyses lying over the very deUcate hyaline 

 membrane of the asci, which, together with the enclosed 

 sporidia, in consequence appear wrinkled or striated. 



1. P. COMMUNIS, B. C. Sporidia in asci 2, very large, 

 elliptical, pale yellow, enveloped in a h} aline double 

 membrane, giving the appearance of a broad, double 

 margin. Plate IX. fig. 3. 



Lichen pektusus (Liim.) Sm. E. Bot. 677. (1799.) 

 Thelotrema pertusum, Ach. Meth. 131. (1803.) 

 Peutusabia communis, D. a ri. Fr. ed. 3. v. ii. 320. (1805.) 



Turn. 8f Borr. Lich. Brit. 190. 



FrieSy L. Reform. 420. 



Hook. Br. n ii. 160. 

 PoBiNA PERTUSA, Ach. L. Uiiiv. 308. (1810;) Syn. 109. 



_ _ Tayl M. Hib. pt. ii. 102. 



Endocarpon pertusum, Wahl. El. Lapp. 459. (1812.) 



Sussex ! Mr. Borrer. (Spec. Exsic.) ! Bolder s Licit, 

 Brit, Oswestry, Shropshire ! Bev, T. Salioey, 



Specimens of P. communis y, Turn, and Borr., and 

 P, communis 5, Turn, and Borr. {Porina leioplaca, Ach.*) 

 communicated by Mr. Borrer, did not differ from P. com- 

 munis a, except in general appearance, and colour exter- 

 nally. In section, under the waxy cortical layer, was a 

 green stratum, the rest being cream-coloured ; the nuclei 

 were numerous, enclosed in a waxy membrane or tunic ; 



* "According to a specimen from Acluirius. Fries, I see, joins the 

 Achariau synonym with lAchen melaleiicus, E. Bot." Borrer, in Hi. 1850. 



