34 FUNGUS-FLOEA. 



A well-marked species, usually densely gregarious and 

 pointing in all directions. The matrix is blackened by the 

 dark hyphae of the subiculum. 



HTPODEEMA. D. C. 



Ascophores innate, oblong or elliptical, blackish, at first 

 covered by the epidermis, thin and membranaceous, dehiscing 

 by a narrow, longitudinal slit; asci clavate, apex narrowed, 

 base contracted into a slender stem, 8-spored ; spores slen- 

 derly cylindrical or fusiform, much shorter than the ascus, 

 multiguttulate then often 2-4-septate, hyaline, arranged in a 

 fascicle in the upper wide part of the ascus ; paraphyses fili- 

 form, septate, apex often wavy. 



Hypoderma, D. C, Mor. France, ii. p. 30i; Eehm, Krypt.- 

 Flora, Hyst., p. 32; Sacc, Syll, ii. p. 784. 



Hysterium, of some authors. 



Allied to Lophodermium in habit, and in the thin, membra- 

 naceous excipulura, but distinguished by the shorter and 

 thicker spores. 



Hypoderma commune. Duby, Mem. Hyst., p. 41; 

 Eehm, Krypt.-Flora, Hyst., p. 32 ; Sacc, Syll., n." 5797. 



Scattered, innate, roundish or elliptical, ends obtuse, 

 opaque, black, lips rugulose, at length slightly gaping and 

 exposing the dingy disc, up to 1-5 mm. long ; asci ovately 

 clavate, apex rounded, attenuated below into a slender stem, 

 very delicate, 8-spored ; spores narrowly cylindrical or very 

 slightly fusiform, ends blunt, straight, smooth, hyaline, 

 becoming 1-septate at maturity, 18-22 x 4-5 /j., grouped in 

 a more or less parallel fascicle in the widest part of the 

 ascus ; paraphyses delicate and slender, straight or wavy at 

 the tip. 



Hysterium commune, Fries, Syst. Myc, ii. p. 589 ; Cke., 

 Hdbk., p. 761. 



On dry stems of herbaceous plants, hop, willow-herb, 

 aconite, Artemisia, &c. 



Spermogonia. Minute, roundish, shining black, rugulose ; 

 spermatia elongated, ends blunt, hyaline, straight or curved, 

 continuousj 7x1" 5-2 /t. 



