174 FLOEA ANTARCTICA. [Auckland and 



Hab. Lord Auckland's group ; on the leaves of Panax simplex, Forst. 



Macula omnino superficiales, orbiculares, epiphylte, 2 lin. latse, opacse, olivaceo-nigrce, Lichenem parvum Fu- 

 cumve referentes, lobatfe, lobis apice dilatatis e filamentis approximatis constantibus. 



This pretty species, which was unfortunately not found in fruit, resembles somewhat Rhytisma quercinum, 

 Rudolph, for which I am indebted to Dr. Montague. That species, however, originates beneath the cuticle, while 

 this is, I believe, entirely superficial. The ramification is different, the tips of the branches being dilated in a fla- 

 bellate form. The stroma, also, consists of approximated threads, not of an irregular cellular membrane. This struc- 

 ture is almost identical with that of Myrionema punctiforme, Harv., except that the filaments are there much branched, 

 which I do not find to be the case here. 



This species is accompanied with another in a very imperfect state, and which may be a species of Dothidea. 



Plate LXVIII. Fig. VII. — 1, leaf of Panax, with fungus, of the natural size ; 2, portion of the same, magni- 

 fied; 3, filaments, very highly magnified. 



8. HYSTERIUM, Tod. 



1. Hysterium breve, Berk.; peritheciis brevibus ellipticis nigris prominulis, rima angustissima, ascis 

 linearibus elongatis. (Tab. LXVIII. Fig. VIII.) 



Hab. Campbell's Island ; on the dead leaves of Uncinia Hookeri, Boott. 



Perithecia minuta, nigra, nitida, prominula, breviter elliptica, raro utrinque apiculata, rima angustissima. Asci 

 elongati, liueares, paraphysibus filiformibus rectiuscidis immixti, sporidiis fibformibus. 



This species is manifestly different from the small form of H. culmigenum, and the nature of the asci and para- 

 physes are further distinct, being in the latter plant shorter and of a different form, with the apices of the paraphyses 

 curved or curled. The apiculate extremities may not prove to be a constant character, though the probability is that 

 it will, at least in full grown specimens. 



Plate LXVIII. Fig. VIII. — 1, leaf and fungus of the natural size; 2, portion of the same; 3, peritheeium 

 shewing the contained asci ; 4, ascus ; all more or less magnified. 



9. AYLOGRAPHUM, Mberf. 



1. Aylogeaphuh Bromi, Berk.; peritheciis simplicibus filis arachnoideis comitatis, sporidiis oblongis 

 uniseptatis medio constrictis. (Tab. LXVIII. Fig. IX.) 



Hab. Lord Auckland's group ; on the leaves of Bromus antarcticus. 



Mycelium arachnoideum, fuscum, quandoque abundantius et sterile, in maculis autem fertilibus parcum. Peri- 

 thecia minima, oblonga, brevia, recta v. curvata, simplicia, atra, nitida. Asci brevissimi, obovati, tenerrimi. Sports 

 octonae, oblongo-ellipticse, medio constricts, uniseptatse. 



The species of this genus, which has principally been investigated by Madame Libert, resemble extremely mi- 

 nute Opegrapha. The present individual approaches the A. junceum, but differs from it and from all others by the 

 septate sporidia. The peritheeium easily breaks up into its elemental cells, and such I find to be also the case with 

 some of Madame Libert's species ; while, in others, the cellular structure is more permanent and forms a beautiful 

 microscopic object. 



Plate LXVIII. Fig. IX. — 1, a portion of leaf and fungus, of the natural size ; 2, peritheeium, magnified, showing 

 the contained asci ; 3, ascus ; and 4, sporidia : — highly magnified. 



