FABLOWIA — MYTILIDION. 25 



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

 above ; spores more or less elongato-fusiibrm, 3-7-septate, 

 biseriate, coloured when mature. 



Mytilidion (erroneously written Mytilinidiori), 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 clavate, 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 /x; paraphyses numerous, very slender, 

 1 • 5 fx thick, septate, branched above. 



Lopliium laeviusculum, Karsten, Symb. Myc. Farm, p. 261. 



On v/orked 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 o-7-septaie. 



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, 1-lj; mm. long, h mm. broad, 

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



