4 BROOKLYN BOTANIC GARDEN MEMOIRS 



and I crossed the lake and visited the same spot in order to collect 

 more material. The dry weather during the latter part of July had 

 lowered the water in the ravines so that this particular sphagnum 

 moor was water-free although the ground was very soft and wet. 

 The fruit bodies of the fungus were not very abundant, but here and 

 there a single one was found on a sphagnum plant, rarely two or more. 

 In nearly all cases the fruit body was attached on the upper side of 

 the central part of the terminal rosette, or one of its radiating branches. 

 Rarely was a fruit body found attached to one of the lower branches. 

 Altogether some 30 or 40 fruit bodies were collected. A number were 

 fixed in Flemming's solution, some in Biondi's solution and some in 

 chrom-acetic solution. Other material was carried to Ithaca on the 

 living sphagnum, where a few more fruit bodies were fixed. Some 

 were kept during the winter in moist situations out of doors, and 

 others in doors in a dried state. Finally, during the winter of 1916- 

 17, it was revealed to me in a semi-vision, that this fungus was a 

 member of the interesting genus Endogone. 



Structure of the fruit bodies, or complex zygocarps. — The plants are 

 2-4 mm. in diameter, pulvinate, concave below and convex above, so 

 that a section through the center parallel with the morphological axis 

 is reniform. The larger plants are slightly convoluted or mildly 

 lobed, the upper portion showing two to three broad, low convolutions. 

 As the resting spores mature the plants are orange-yellow in color, 

 but the pigment resides entirely in the spore content, the mycelium 

 and spore walls being hyaline. 



The peridium is thin, white, and composed entirely of a dense, 

 pliant weft of the terminal, slender branches of the radiating mycelium. 

 The terminal branchlets are 3-5 jj. in diameter at the base and taper 

 out to a very slender point i ^i or less in diameter. The walls are 

 much thickened, so that the lumen of these narrow branchlets is 

 nearly closed, quite so toward the apex. Many of these slender 

 branchlets are free above the surface and give to the peridium a 

 minutely tomentose, felt-like surface. Many of these branchlets arise 

 very close together, and then are more or less dichotomously branched 

 at a distance, a peculiarity often quite characteristic of the stouter 

 internal mycelium. 



Internal mycelium and hold-fast. — The internal mycelium has a 

 general radial direction from the basal depression, diverging in all 

 directions toward the peridium. The main hyphae are 12-15 f^ in 

 diameter. The branching is di- or trichotomous, or 4 to 5 or more 

 branches arise close together, their point of origin often suggesting a 

 ganglion-like enlargement of the parent hyphae from which the 

 branches radiate. The course of the hyphae is more or less sinuous. 



