160 endosporejE. [eeticulabia. 



oval or spherical clusters of 5 to 25, warted on the exposed 

 surface, elsewhere smooth, 11 to 12 ju. 



Hah. On fir wood. — Denmark. 



This appears to be a form of E. oUvaceum intermediate between the 

 usual type and the simple type from Glen Tanner referred to under 

 Liceajlexuosa. 



4. E. macrosperma Eaunk., I.e., is described as similar to E. 

 oUvaceum, but the spores are spinulose on the outer surface and 

 12 to 14 fx, diam. 



Hub. On fir. — Denmark. 



It is very doubtful if the slightly larger size and more spinulose 

 markings of the spores is a suflacient character on which to base specific 

 difference. 



Genus 32.— RETICULARIA BuUiard, Champ., p. 95 (1791). 

 -^thalium composed of numerous elongated interwoven sporangia, 

 with their walls partly evanescent, partly persistent, forming 

 chambers and strands, and dividing above into delicate capillitium- 

 like threads ; spores and threads rusty-brown. 



KEY TO THE SPECIES OF EETICULABIA. 



Spores minutely reticulated. 1 . R. Lycoperdon 



Spores coarsely reticulated. 2. R. lohata 



1. R. Lycoperdon Bull., I.e., t. 446, f. 4 (1791). Plasmodium 

 creamy- white, on dead wood, ^thalium pulvinate or subglobose, 

 2 to 6 cm. diam., enclosed in a thin smooth silvery cortex, seated 

 on a well-developed hypothallus of interwoven membranous strands. 

 Capillitium consisting of the persistent remains of the sporangium- 

 walls, forming irregular chambered and branching strands 

 arising from the hypothallus, dividing above into numerous 

 delicate flattened and flexuose threads ; together with the spores 

 pale rusty-brown. Spores somewhat turbinate, thickened and 

 closely reticulated on the rounded side, the remaining part 

 marked with scattered warts, 6 to 8 /* diam. — Host., Mon., 

 p. 240; Cooke, Myx. Brit., p. 60; Blytt, Bidr. K. Norg., Sop. 

 ui. (1892), p. 10 ; Mass., Mon., p. 93. Reticularia umbrina 

 Fr., Syst. Myc, iii., p. 87. R. argentea Corda, Ic. Fung, vi., p. 15. 



Plate LIX., B. — a. aethalium, half natural size ; J. capillitium, x 80 ; 

 V. spores, X 600 (England). 



In Eethalia developed in a moist atmosphere under a glass shade the 

 silvery cortex formed by the drying of the outer ends of the sporangia 

 is not produced, but the convolute sporangia are filled with spores 

 to their apices, which gives an irregular brain-like surface to the 

 Eethalium. In some gatherings the walls of the sporangia are much 

 mote persistent than in others, and have almost the character of 

 Enteridium, to which genus Reticularia is closely allied. 



Hah. On dead wood. — Bristol (B. M. 18) ; Leytonstone, Essex 

 (L:B.M.131); Germany (Strassb. Herb, and B. M. 649); Sweden 

 (K. 977). 



