284 



Mycologia 



thickened at the end of the spores ; particularly of those spores 

 at or near the apex of the ascus. This exospore is externally 

 thrown into folds but never into warts, prickles or tubercles. 



Genea cubispora sp. nbv. 



Ascocarp when dry 7 to 9 mm. in diameter and 5 to 8 mm. in 

 vertical thickness, slightly larger when fresh, with somewhat 

 cerebri form external folds and involutions which have a tendency 

 to radiate from the central opening. When fresh the whole 

 surface was isabelline in color,, but when dry and after handling 

 the exposed convex edges of the folds are castaneous. Surface 

 mealy and very slightly pubescent, surrounding mycelium scanty. 

 Cavity single, but thrown into irregular pockets by the folds and 

 involutions of the surface. Opening central, 1 to 2 mm. wide, 

 the edge turned in nearly to the base of the cavity. Ascocarp 

 wall 700 to 800 /x thick, the outer 100 to 150/x consisting of large 

 pseudoparenchymatous cells, the next 100 to 150/x of tangled, 

 frequently septate hyphae 5 to 10/x in diameter, the remaining 

 500 to 600 fx consisting of the hymenium. Hymenium continuous, 

 not areolate ; asci cylindric, 300— 350 X 25-30 /x, rounded at the 

 apex and tapering abruptly at the base. Paraphyses filiform, 

 occasionally, but indistinctly, septate, overtopping the asci 75 to 

 no fx and forming a secondary cortex. Ascospores eight, mono- 

 stichous, the basal and central ones almost isodiametric, 

 27-28 X 24-28 jx, the one or two nearest the apex often longer, 

 36-42 X 24-28 /x. Lumen of spores 14-18 /x wide and 16-22 fx 

 long; the endospore 1.2-3 H- thick. Epispore laterally 0.2-4 /x in 

 thickness and 2-4 /x thick on the ends of all the spores except 

 those at or next to the apex where the thickness reaches 5-10 /x. 

 Epispore thrown into irregular folds but without papillae, tuber- 

 cles or reticulations. Ascospores polygonal in cross section, occa- 

 sionally even square. 



In black leaf-mold 3 to 8 cm. below the surface in forest con- 

 sisting of dense growth of Acer saccharum, Tsuga canadensis, 

 Betula lutea with considerable Abies balsamea. Between Bass 

 and Little Bass Lakes of the Cisco Lake chain, Gogebic County, 

 Michigan, August 14, 1919. No. 123 Bessey and Darlington. 



Michigan Agricultural College, 

 East Lansing, Michigan. 



