298 FUNGUS-FLORA. 



The mycelium, spirally contorted, also the lower portion 

 of the fertile hyphae, and the latter sometimes flexuous up 

 to the apex. 



***** Brownish. 



Aspergillus nigricans. Cooke. 



Fertile hyphae erect, colourless, simple, not septate, apex 

 inflated into a globose vesicle ; Bterigmata linear ; conidia 

 in chains, globose, smoke-coloured, o /x diameter. 



Aspergillus nigricans, Cooke, Journ. Quekett Micr. Club, 

 1885, p. 3, pi. 9, f. 3 ; Sacc, Syll., iv. n. 337. 



In meatus auditorius of human ear. 



The heads of conidia are black in the mass. 



STEEIGMATOCYSTIS. Cram. (figs. 27, 28, p. 313.) 



Mycelium creeping, fertile branches erect, not branched, 

 tip inflated and covered with radiating basidia-like out- 

 growths, each producing at the summit several slender 

 spines or sterigmata ; these latter in turn bear each a chain 

 of conidia. 



Sterigmatocystis, Cram., Yiert. Xat. Gesell., Zurich, 1859 ; 

 Sacc, Syll., iv. p. 71. 



With the general habit of Aspergillus, but known by the 

 well-developed basidia and whorled sterigmata bearing the 

 catenulate conidia. 



Sterigmatocystis dubia. Sacc. (figs. 27, 28, p. 313.) 



Tufts minute, white ; mycelium creeping, fertile threads 

 erect, without septa, head globose ; basidia slender, radiating, 

 each with 3-4 slender sterigmata at the apex, conidia in 

 chains, glohose, colourless, 4—5 /x diameter. 



Sterigmatociistis duhia, Sacc, Syll., iv. n. 346. 



Aspergillus duhius, B. & Br., Ann. Xat. Hist., n. 520. 



On decaying cheese, duug, &c. 



AMBLYOSPOPJUM. Fres. (fig. 30, p. 313.) 



]!ilycelium copious, cree[)ing, septate, interwoven ; fertile 

 hyphae ascending, tips not inflated but furnished with 



