INTRODUCTION TO CRYPTOGAMIC BOTANY. 



391 



ture of any species, but the figure of Eschweiler seems to indi- 

 cate, from the linear arrangement of the sporidia, that there 

 are asci. The perithecia open exactly in the same way as 

 those of Phacidium, especially P. Delta, Kze. (Fig. 66, h), a 

 species which is very abundant in Madeira on the leaves of 

 laurels. The dehiscence in the other genera is much less 

 regular, and it is very probable that in Cliostomum, in which 

 the corrugated appearance is due to the contraction of the 

 peridium, and dehiscence takes place eventually in the direc- 

 tion of these contractions, the spores are naked. Gyro- 

 stomimi, Fr., is founded on Lecidea scyphulifera, Ach., a 

 species from Sierra Leone, which appears to be truly ascige- 

 rous ; but I have had no opportunity of examining any species. 

 Strigula Bahingtonii, Berk., which is common on leaves of 



^^ 



Fig. 80. 



a. Strigxda nemathora* 



b. Strigula Feei, with section of peritliecium, asci, paraphyses, and 

 spoi-idia. From Ceylon. Communicated by Mr. Tliwaites. 



c. Cephalexxroid con<iitiou of some Strigula. From Caripi. Com- 

 municated by Mr. Spruce. 



d. Pai'aphyses of a Lecidea allied to L. sabidetorum, bearing stylo- 

 spores. From the late Mr. Gardiner. 



All more or less mamified. 



* Mr. Babington considers Sttngida as belonging to Ven'ucariei, but 

 the epiphyllous subepidermic origin and irregular rupture seem to 

 distinguish it. 



