arcyria] arcyriaceae 245 



faint irregular spiral bands ; threads attached at numerous 

 points to the persistent plates of the sporangium- wall and with 

 a few attachments to the cup ; free ends with spinulose tips 

 are sometimes present. Spores pale red, nearly smooth, 

 marked with few scattered warts, 7 to 8 //, diam. — Mass. 

 Mon., 147 ; Macbr. N. Am. Slime-Moulds, 191 ; Petch in 

 Ann. Perad.. iv. 367. A. vermicularis Schum. Enum. PI. Saell., 

 ii. 212 (1803) ? A. punicea var. vermicularis Fr. Syst. Myc, 

 hi. 178 (1829) ? A. incarnata (3 flexuosa Fr. I.e., 179. A. 

 fuliginea Cooke & Mass. I.e., 169. A. magna Rex in Proc 

 Acad. Nat. Sci. Phil., 1893, 364; Macbr. I.e., 190. Hemi- 

 arcyria fuliginea Cooke & Mass. in Grev., xvi. 74 (1888). 



PI. 180. — a. sporangia ; b. shield-like persistent portion of sporangium-wall with 

 capillitium threads attached ; c. capillitium with fragment of cup, and spore ; 



(England). 



A specimen from Baden in Strassb. Herb, marked " Oerstedt " is 

 a typical example of the present species. Although nearly allied to 

 A. nutans, it differs hi colour, and in the spines on the capillitium 

 being more slender and closely set and more evenly distributed ; it 

 also differs in the presence of the well-defined persistent portions of 

 the sporangium-wall, which appears to be a very constant feature. 

 Specimens received from different parts of the world possess the 

 same characters with but little variation. The type of Hemiarcyria 

 fuliginea Cooke & Mass. from New South Wales (K. 154), has the 

 capillitium attached to persistent papillose plates of the sporangium- 

 wall, and resembles typical gatherings of .4. Oerstedtii, except in the 

 colour, which is now fuliginous-brown. The constrictions and ovoid 

 swellings in the capillitium, mentioned by Rostafinski as characteristic 

 of this species, frequently occur in irregular developments of 

 A. incarnata and other Arcyriae, and cannot be held to be of specific 

 value. Arcyria magna Rex, and A. magna var. rosea Rex (B.M. 1518), 

 appear to be forms of the present species. They are respectively 

 tawny-grey and rosy-red in colour. The two varieties have been 

 found twice in Fairmount Park, Philadelphia; each time they were 

 closely associated on the same log of wood. The capillitium expands, 

 into long drooping columns, to which in var. rosea persistent papillose 

 plates of the sporangium-wall are attached. The sporangial cups are* 

 smoother and the markings of the capillitium threads rather stouter 

 than in typical A. Oerstedii. 



Hob. On dead wood. — Devon (B.M. 1515) ; Failand, Somerset 

 (B.M. 3101); Sutton, Warwick (B.M. 1517); Runton, Norfolk (B.M. 

 3102) ; Mid-Lothian (B.M. 3103) ; Hamburg (B.M. 3104) ; Berlin 

 (B.M. 3105) ; Norway (B.M. 1516) ; Denmark (K. 893) ; Switzerland 

 (B.M. 3106) ; Bohemia (B.M. 3107) ; Portugal (B.M. 3108) ; Ceylon 

 (B.M. 3109) ; Java (B.M. 3110) ; New South Wales (K. 154) ; Kansas 

 (B.M. 3111) ; Philadelphia (B.M. 3112). 



14. A. occidentalis Lister. Plasmodium? Sporangia stalked 

 or sessile, angled by mutual pressure, ellipsoid, 0-7 to 0-9 mm. 

 high, 0-4 to 0*5 mm. broad, rosy copper-coloured fading to 

 yellowish- buff ; sporangium -wall more or less evanescent above, 



Q 



