216 



Mycologia 



Ete. — Dans les forets de la plaine. II me parait distinct du 

 sulcata auquel je favais reuni comme variete. (PL VIII, fig. 



i'so 



Late in the autumn during three successive years the writers 

 have collected plants which they have referred to this species 

 along the marshy wooded banks of a small sluggish stream on 

 Mt. Toby near Sunderland. They grow from mossy rotten logs 

 and limbs which are partly submerged in the stream, moss-cov- 

 ered rocks, muck, or leaf-mold but always very close to the 

 water. Frequently specimens were found completely submerged. 

 Because we were never fully satisfied as to the identity of these 

 plants, very full notes were always recorded. The following de- 

 scription is condensed from notes on some fifty fresh specimens 

 collected during the three years : . 



Pileus not saddle-shaped or compressed (except occasionally 

 in young stages), usually convex and somewhat agariciform, ir- 

 regularly undulating on the upper surface, thin and weak, easily 

 splitting back from the wavy margin, drooping and sometimes 

 adnate to the costae, but most often found with margins entirely 

 free, 1-3 cm. broad, usually fuscous above, but occasionally 

 lighter (to smoke-gray of Ridgway), lower surface concolorous 

 with the stipe. The costae from the stipe continue outward on 

 the lower surface of the pileus as prominent radiating and 

 branching veins disappearing toward the margin (See fig. 7). 

 Stipe even or frequently attenuate downward, glabrous, smoke- 

 gray or sometimes lighter (to almost white), 2-4 cm. high by 

 4-7 mm. in diam., sulcate-costate, the costae narrow and high, 

 only rarely anastomosing, entire stipe composed of these solid 

 plate-like costae united by their inner edges. Asci 200-300 X 

 16-20/A, cylindrical, with 8 uniseriate spores. Spores ellipsoidal, 

 hyaline, smooth, with large central oil drop, 14-18 X 10-12/x. 

 Paraphyses of the same height or a little longer than the asci, 

 septate, slender, gradually enlarging upward to 5— 6ft. (PI, 11, 

 figs. 6, 7.) 



The microscopic characters of the species are not distinctive 

 but in the very prominent veins which spread over the lower 

 surface of the free pileus it is very distinct from any other species 

 which we have found here. 



The plants seem very much like H. palustris of Peck both in 

 form and in habit and were at first referred there, but Peck does 



