The species Helvella crispa is white or pallid throughout, cap very irregular, sometimes deeply concave in the centre, with margin at first erect, then drooping; again it is undulating, much divided and deflexed; in fact, so irregular is the shape that scarcely two specimens will show the cap the same in outline; stem stout and deeply channelled. Spores elliptical, transparent. Habitat woods, growing singly or in groups, but not caespitose. Fig. 6, the ascus or spore sack and paraphyses. _Genus Mitrula_ Fries. Soft and fleshy, simple capitate, stem distinct, hymenium surrounding the inflated cap; head ovate, obtuse, inflated.--M. C. Cooke. Cooke says of this genus that it is scarcely so well characterized as many with which it is associated, and that some of the species are evidently so closely allied to some of the species of the genus Geoglossum that it is difficult to draw the line of demarcation between them, particularly so with the species Mitrula _pistillaris_ B. from Louisiana. The plants are very small, and though none are recorded as poisonous, only one or two have any value as esculents. FIG. 7. =Mitrula sclerotipes= Boudier. The cap in this species is small, and the stem long and slender. The spores are transparent, the asci club-shaped. The plants of this species are always found springing from an oblong sclerotium; hence the name sclerotipes. Fig. 8 represents the sporidia enclosed in their asci with paraphyses and individual spores, the latter magnified 800 diameters. Fig. 9, sectional view of mature plant. FIG. 10. =Mitrula vitellina= Sacc., var. _irregularis_ Peck. Saccardo, in his Sylloge Fungorum, includes in this genus those having a club-shaped cap, which brings into it, with others, the species Mitrula _vitellina_ Sacc., formerly classed in the genus Geoglossum, and its variety _irregularis_ Peck. The latter was first described in 1879, in Peck's Thirty-Second Report, under the name Geoglossum _irregulare_. Prof. Peck now gives preference to the name assigned to it by Saccardo, and it is so recorded in Peck's later reports. Prof. Peck records this species as edible, and recommends it as having tender flesh and an agreeable flavor. It sometimes grows in profusion in wet mossy places, in woods, or swampy ground. It is bright yellow in color, clean and attractive. The cap is much longer than the stem, often deeply lobed, extremely irregular in outline, and tapers to a short yellowish or whitish stem. The spores are narrowly elliptical and transparent. The specimen illustrated is from a small one figured by Peck. The plants sometimes reach two inches in height. They are most abundant in temperate climates. [Illustration: Plate D. FOUR TYPES OF THE GENUS MORCHELLA. T. TAYLOR, DEL. THE NORRIS PETERS CO., PHOTO-LITHO., WASHINGTON, D. C.] PLATE D.