474 GRAPHIDACEAE. 



eommonlj^ it is olivaceous, 0. Bonplu,ndi has been fotind in a number of 

 localities in Bermuda and on a variety of trees. 



Gr aphis Afzeiii Ach, is so striking and distinct that it would attract 

 the attention of anj'one, having prominent white apothecia of large size (tip 

 to 5 mm. long and 1 mm. wide) standing out against the brown thallus. 

 Graphis scripta (L.) Ach. and its close allies, G. Lineola Acli. and G. 

 Pavoniana Fee, all have fine, black apothecia, very variable in length and 

 in the degree of curving and branching; the disk is a mere cleft. G. 

 striatula (Ach.) Nyl. closely resembles G. scripta, but if the apothecia are 

 examined with a hand-lens, the margins will be seen to be longitudinally 

 furrowed. In Phaeograpliis lobata (Eschw.) Muell. Arg., the apothecia 

 are also black, but the disk is flat and relatively broad. All of these species 

 grow on bark, and are well-known tropical lichens with a wide distribution. 



Family 3. CHIODECTONACEAE. 



The genus Chiodecton is doubtfully represented by a sterile, white, 

 crustose thallus, soft and more or less cottonj^ in texture, found in several 

 localities. This agrees with the thalline characters of C. Montagnei Tuck., 

 but as it has not yet been found in fruit, the identity of the plant is 

 uncertain. 



Sclerophyton elegans Eschw. belongs to this family, but on account 

 of its resemblance to an Arthonia it has been discussed under that genus. 

 It might be taken for a Graphis but its violet-brown apothecia are more 

 delicate than in any Bermuda species of Graphis. 



Glyphis cicatricosa Ach. is another instance of a well-known tropical 

 lichen common in Bermuda. Several apothecia are immersed in a common 

 stroma, the disks being dark brown, flat, and irregular in outline. This is 

 the only lichen in Bermuda having the fruit in a stroma and an open, 

 flat disk. 



Order 4. CYCLOCARPALES. 



Family 1. THELOTREMACEAE. 



The lichen-flora of Bermuda is of interest not only for the species 

 found there, but also for the absence of species that one would expect. 

 Thus, the families Trypetheliaceae and Thelotremaceae are well-represented, 

 both as to species and as to individuals, in the West Indies and in the 

 southern United States, yet these families have only two representatives 

 each in Bermuda. Gyrostomum scyphidiferum (Ach.) Fr. and Leptotrema 

 trypaneoides (Nyl.) Riddle are the Bermuda species of Thelotremaceae. 

 Both grow on bark. But they are very distinct from each other and from 

 all other Bermuda lichens. Gyrostomum has urn-shaped apothecia, with a 

 comparatively thick, black rim,, more or less surrounded by the pale 

 thallus. Leptotrema trypaneoides has the apothecia entirely immersed in 

 the thallus and opening by small holes, so that the thallus appears as if 

 perforated with pin-pricks. 



Family 2. GYALECTACEAE. 



Microphiale lutea (Dicks.) Steiner, although common elsewhere, is 

 apparently rare in Bermuda, only a single small specimen having been 

 found on the bark of Melia at Tucker's Town. The thallus is vei^^ thin 



