FARLOWIA MYTILIDION. 25 



8-spored, paraphyses filiform, septate, hyaline, branched 

 above ; spores more or less elongate-fusiform, 3 7-septate, 

 biseriate, coloured when mature. 



Mytilidion (erroneously written Mytilinidion), Duby, Mem. 

 Hyster., p. 62; Sacc., SylL, ii. p. 760. 



Lophium resembles the present genus in the mussel-shaped 

 ascophore, but is at once distinguished by the long, filiform, 

 hyaline spores. Hysterium differs in the ascophore not being 

 mussel-shaped. 



* Spores 3-septate. 



Mytilidion laeviusculum. Sacc., Syll., n. 5704. (figs. 

 39-41, p. 22.) 



Gregarious, sessile on a broad base, mussel-shaped, ver- 

 tical and laterally compressed, black, almost smooth, lips 

 thin and closed at first, then slightly gaping; cells of 

 excipulum small, blackish externally, forming a compact, 

 parenchymatous tissue ; asci cLivate, apex rather acute, nar- 

 rowed below into a somewhat slender pedicel; spores 8, 

 irregularly biseriate, narrowly fusiform, straight or some- 

 times with a very slight suggestion of becoming sigmoid, 

 3-septate, smooth, very pale yellowish brown at maturity ; 

 15-20 X 2-5 x 3' 5 /*.; paraphyses numerous, very slender, 

 1 5 p. thick, septate, branched above. 



Lophium laeviusculum, Karsten, Syrnb. Myc. Fam., p. 261. 



On worked pinewood. 



Gregarious, mostly with the long axis of the fungus 

 parallel to the grain of the wood. Specimen examined from 

 Karsten's Fung. Fenn., n. 771. 



Forma minor : asci and spores a trifle smaller than in the 

 typical form. 



On pine leaves. 



** Spores 5-7-septate. 



Mytilidion gemmigenum. Fuckel, Symb. App. i., 

 p. 299; Sacc., Syll., n. 5711. 



Somewhat gregarious or more frequently scattered, not 

 seated on a black stain, superficial, vertical, not much com- 

 pressed, ends obtuse, slightly striate transversely, upper edge 

 obtuse, slit very narrow, black, l-l mm. long, \ mm. broad, 

 up to 1 mm. high ; asci cylindrical, apex rounded, base nar- 



