INTRODUCTION TO OEYPTOGAMIC BOTANY. 



S99 



The gonidia in this genus, as also in Synalyssa, which belongs 

 to another tribe, are totally diiFerent from those of Lichina 

 and approach closely the type oi Palmella, figured at p. 118.* 

 Mastodia has the habit and form of an Ulva, but the peri- 

 thecia are those of Lichinei. Ephebe also finds its true place 

 here, after being shifted about in various directions. The frond 

 is essentially that of an Alga, and is destitute apparently of 



Fig. 84. 



a. Paulia perforata, Mont. Gonidia and asci, from a specimen com- 

 municated by Dr. Montagne. Magnified. 



b. Calieium tympanellum. Peritheeium and sporidia from Moug. and 

 Nest., No. 859. Magnified. 



c. Graphis Leprevostei, Mont., representing a portion of the natural 

 size ; a young fertile swelling cut through, showing the excipulum ; 

 young asoi from the same, with branched tissue, in which they are in- 

 volved, and a sporidium, All more or less magnified. From a Cuban 

 specimen, from Dr. Montagne. 



true gonidia. Some species, in fact, so closely resemble Seiro- 

 siphon, that without the fruit they could never be separated. 

 One or two filiform species of doubtful affinity yet remain, 

 especially Gystocoleus ; but without true fruit it is impossible to 

 speak with certainty. Tulasne finds, in Lichina confinis, sper- 

 matogonia on the same branches with the perithecia, and 



* See Thwaites, in Ann. of Nat. Hist., vol. 3, p. 219. 



