198 ENBOSPOREAE [RETICULARIA 



(B.M. 2813) obtained by Mr. W. B. Allen in the rosy plasmodium stage 

 at Shiriett, Salop, and matured indoors, shows all stages between single 

 spherical sporangia, 0-2 to 0'3 mm. diam., small subglobose aethalia 

 1 to 2 mm. diam., and larger aethalia 5 to 10 mm. long ; the spores 

 are perfectly formed and free. This variety of form from one Plasmo- 

 dium is probably due to unfavourable conditions of development. 



Hob. On dead wood.— Ascot, Berks (B.M. 14) ; Kent (B.M. 13) ; 

 Boynton. Yorks (B.M. 1158); Shiriett, Salop (B.M. 2813); Norfolk 

 (B.M. 2814); Appin, Scotland (K. 1670); France (B.M. 2816); 

 North Germany (B.M. 2815) ; Denmark (B.M. 1722) ; Poland (Strassb. 

 Herb.); Bohemia (B.M. 2817) ; New Jersey (K. 835) : var. liceoides— 

 Alderbury, Wilts (B.M. 1712) ; North Germany (B.M. 2232) ; New 

 Hampshire (B.M. slide). 



2. E. Rozeanum Wing, in Proc. Acad. Nat. Sci. Phil.. 1889, 

 156. Plasmodium flesh-coloured. Aethalium hemispherical 

 or subglobose, 5 to 30 mm. diam., red-brown ; sporangium- 

 walls within the aethalium perforated, forming a network 

 of broad membranous bands, or sometimes frayed into strands 

 and slender threads as in Beticularia. Spores rusty-brown, 

 closely and evenly reticulated on two-thirds of the surface, 

 the remaining part faintly war ted, 7 to 9/x diam.— Macbr. 

 in Bull. Nat. Hist. Iowa, ii. 117; Mass. Mon., 46. Reti- 

 cularia (?) Rozeana Rost. Mon., App. p. 33 ( 1876). R. splendens 

 Morg. Myx. Miami Valley, 11 (1893). Enteridium splendens 

 Morg. in litt. ; Macbr. N. Am. Slime-Moulds, 151 (1899). 



PI 153— e aethalium; half is seen in vertical section, showing the persistent 

 sporangium-walls and the barren base ; /. perforated sporangium-walls ; g. spores ; 

 (United States). 



Mr. Wingate states that specimens received by him from M. Roze, 

 obtained from near Paris, identify the American gatherings with 

 Reticularia Rozeana Rost., the type of which appears to be now lost. 

 No further European gatherings of the present species appear to have 

 been obtained. Prof. Macbride is of the opinion that Wingate 's 

 identification may have been incorrect, and prefers to use a later 

 name, given by Morgan, E. sjilendens, for what is a common American 

 species. There is no doubt, however, that the specimens from 

 Philadelphia described by Wingate as E. Rozeanum are the present 

 species, and we do not seem to have sufficient evidence to disturb the 

 name he adojuted. 



Hob. On dead wood.— British Columbia (B.M. 2819) ; Maine 

 ((B.M. 1613) ; Ohio (B.M. 1446) ; Iowa (B.M. 1445) ; Colorado (B.M. 



.2820). 



Genus 35.— RETICULARIA Bulliard Champ., 95 (1791). 

 Aethalium composed of numerous elongated interwoven 

 sporangia, whose walls are partly evanescent, partly per- 

 sistent, and form broad expansions and strands dividing 

 above into delicate capillitium-like threads ; spores and threads 

 rusty-brown. 



