454 FLORA ANTARCTICA. [Fv.egia, the 



Hab. Hermite Island, Cape Horn; on leaves of Viola tridentata. 



Amphigena, pimctifomiis. Mycelium vakle obscurum, e filamentis paucis brevibus parcc ramosis. Perithecia 

 depressa, atro-fusca, e cellulis radiautibus elongatis subregularibus formats ; margine tenui lacerato niernbranaceo 

 pellucido. 



Neither have I been able to detect fructification in tins plant, but the genus is I believe certain. 



Plate CLXIV. Fig. IV. — 1, Viola attacked with Fungus of the natural size ; 2, leaf of ditto and Fungus ; 

 3, perithecium ; 4, portion of edge of ditto : — highly magnified, 



3. Asterina Barwinii, Berk.; epiphylla, maculis parvis orbicularibus e fibrillis radiautibus articulatis 

 marticulatisque, peritheciis irregidaribus demurn depressis centralibus margine laciniato. (Tab. CLXIV. 

 Fig. II.) 



Hab. Cape Tres Montes ; on Azara lanceolata ; C. Darwin, Esq. 



Macula? epiphylla?, orbiculares, -i-1 lin. lata;, e fibrillis radiautibus reticulatisque, partirn e margine perithecii, 

 partim e superficie inferiore enatse, breviter articulatae, aut omnino simplices. Perithecia priinuru irregularia, sub- 

 elevata, demum depressa, margine laciniato laciniis denticulatis. Asci ut in reliquis speciebus globosi ; sporidia 

 oblonga, biloculata. 



Apparently different from A. Azara, Lev., in its perithecia, which are not depressed in the centre, as in that 

 species. Unfortunately I have no opportunity of comparing them. The perithecium, both here and in Asterina 

 microscopica, splits from the centre in a radiating manner when slightly pressed. 



Plate CLXIV. Fig. II. — 1, Asterina Barwinii, Berk., on leaves of Azara lanceolata, of the natural size; 

 2, perithecia and mycelium ; a, cuticle of matrix ; b, incipient perithecium ; c, curious processes given off from threads 

 of mycelium ; 3, fibres of mycelium ; 4, portion of border of perithecium ; 5, processes on threads of mycelium ; 

 6, asci ; 7, sporidia : — all very higldy magnified. 



19. EUEOTIUM, M. 



1. Eurotixjm herbariorum, Lk., Obs. vol. i. p. 29. f. 44. 

 Hab. On biscuit on board the 'Erebus', Jan. 3rd, 1841. 



The sporangia in the specimens before me, which are very scanty, are almost destitute of flocci, but accompanied 

 by an abundant tawny mycelium, thus confirming the opinion of Fries and Corda, that Eurotium epixylon is not 

 really a distinct species. I cannot, however, think with Corda that it has the slightest affinity with Pliysannn. 

 The morphosis has not at present been traced, and till this is done it appears better to let it remain where Fries has 

 placed it, in the neighbourhood of Mucor. 



• The peridium is lined with a stratum of gelatinous cells, which vanish in a great measure as the plant approaches 

 maturity. The flocci in Kze. and Schin., n. 83, are rough and dark, but I find great variation both of surface and 

 colour. 



LV. ALG^E, L. 



1. D'URVILL^A, Bory. 



1. D'UrvilLjEA utilis, Bory, in Duperrey Toy. Bot. p. 65. t. 1 et 2. f. 2. Fl. Antarcl. Pt. 1. p. 167. 

 Laminaria caqjsestipes, Montague in Voy. D'Orbigny, Bot. Crypt, p. 11. t. 2. 



