26 FUNGUS-FLOKA. 



rowed into a pedicel ; spores 8, elongated fusiform or slightly 

 olavate, mostly straight, colourless at first then brownish 

 yellow, 7-septate, irregularly biseriate, 30-36 x 6 /a ; para- 

 physes very slender, about 1 • 5 /u, thick, colourless, branched. 



Mytilidion fusisporum, Sacc, S^'U., n. 5712. 



Lophium fusisporum, Cooke. 



Lophium mytilinum, Cooke, Fung. Brit, exs., ser. ii., n. 200. 



On small branches of larch, spruce, &o. 



Distinguished from M. laeviusculum by the greater number 

 of septa in the spore. The ascophores are truly perennial, 

 and probably produce a new crop of asoi each year. 



An authentic specimen from Fuckel examined; Cooke's 

 types also examined. 



HYSTEEIUM. Tode. (figs. 13-16, p. 22.) 



Ascophore erumpent or subsuperfioial, oblong, elliptical, or 

 linear, black, rigid, dehiscing by an elongated, narrow slit, 

 lips obtuse ; cells of epithecium small, compact, blackish olive 

 externally; asci clavate; spores 8, elongated, 3-7-septate 

 and coloured brown or yellowish at maturity; paraphyses 

 slender, branched and coloured at the apex. 



Hysterium, Tode, Mecklenb., ii. p. 4 ; Sacc, Syll., ii. p. 743 ; 

 Cke., Hdbk., p. 757. 



The species included in the present genus superficially 

 resemble the species belonging to other genera, but are 

 clearly distinguished under the microscope by the coloured, 

 2 or more septate spores. Mytilidion differs in the mussel- 

 shaped ascophore. 



Hysterium pulicare. Pers., Syn. Fung., p. 98 ; Cke., 

 Hdbk., p. 757 ; Sacc, Syll., n. 5034. (figs. 13-16, p. 22.) 



Scattered or gregarious, almost superficial form somewhat 

 variable, for the most part broadly elliptical or almost oblong, 

 ends very obtuse, hard, dull black, longitudinally striate, 

 depressed above, lips very obtuse, slit very narrow, 1-2 mm. 

 long by • 5-1 mm. broad ; asci clavate ; spores 8, imperfectly 

 biseriate near the apex of the ascus, often uniseriate below ; 

 elliptic oblong, ends obtuse, straight or very slightly curved, 

 3-septate at maturity, brown, the two end-cells much paler 



