Growing on moss and lichens, at Wood's Holl, Massachusetts. Sporangium 1-1.5 mm. in height, the stipe very short or sometimes apparently wanting. I am indebted to Dr. W. C. Sturgis, of New Haven, Conn., for a specimen of this unique species. 7. COMATRICHA LONGA, Peck. Sporangia very slender and much elongated, tapering gradually upward, weak and prostrate or pendulous, growing close together on a well-developed purplish-black hypothallus. Stipe and columella capillary, smooth and black, reaching to the apex of the sporangium or often vanishing in the network far below it, the stipe very short, the columella long and flexible. Capillitium of long, slender, dark-brown threads; these are reticulately connected near the base, forming a network of large irregular meshes in a series along the columella; outwardly they are terminated by very long free branchlets, which vary from simple to two or three times forked or branched. Spores globose, minutely warted, dark brown, 8-10 mic. in diameter. See Plate XI, Fig. 31. Growing on old wood and bark of Elm, Willow, etc., in Autumn. Sporangium with the stipe 15-40 mm. in length, the stipe 3-8 mm. long, the sporangium .25-.40 mm. in thickness. This is the most characteristic species of the genus, being farthest removed from Stemonitis. 8. COMATRICHA FLACCIDA, Lister. Sporangia growing closely crowded together and more or less confluent, on a purplish-brown hypothallus, the walls fugacious. Columellas rising simply from the common hypothallus, or sometimes grown together below and then apparently branching, running through to the apex, and there often confluent with each other, or joined together by portions of membrane. Capillitium of slender brown threads, which branch and anastomose very irregularly, forming a ragged network with large irregular meshes, and long free extremities; the capillitium of adjoining columellas being much entangled, and often confluent or grown together. Spores globose, very minutely warted, brown, 7-9 mic. in diameter. Growing on old wood and bark of Oak, Willow, etc. The component sporangia 5-10 mm. in length. The early appearance is much like that of species of Stemonitis, but the mature stage is a great mass of spores with scanty capillitium, as in Reticularia; the columellas, however, are genuine and not adjacent portions of wall grown together. Arthur Lister calls this _Stemonitis splendens_, var. _flaccida_.