246 ENDOSPOREAE [LACHNOBOLUS 



persistent at the sides and at length dividing into four to six 

 deep rounded membranous and papillose lobes. Stalk 

 yellowish-brown, straight or curved, 0-1 to 0-3 mm. high, 

 filled with spore-like cells. Capillitium a loose network of 

 pinkish-yellow threads, 25 to 4 p, diam., With few attachments 

 to the sporangium- wall, marked with spines, warts, and low 

 transverse bands arranged in a lax spiral, otherwise nearly 

 smooth or minutely papillose ; free ends more or less numerous, 

 clavate, papillose. Spores flesh-coloured, smooth except for 

 a few scattered warts, 6 to 7 /x diam.— Lachnobolus incarnatus 

 Macbr. in Bull. Nat. Hist. Iowa, ii. 126 (1892). L. occidentalis 

 Macbr. N. Am. Slime-Moulds, 188 (1899). 



PI. 192. — a. sporangia ; b. capillitium and spores with fragments of sporangium- 

 wall : (Iowa). 



This species somewhat resembles the smaller forms of A. stipata, 

 but is distinguished by the cup of the sporangium dividing into rounded 

 lobes, and in the absence of spiral bands on the threads of the capilli- 

 tium. The flaccid character of the capillitium is not more marked 

 than in many gatherings of A. stipata, and can hardly be regarded as 

 of sufficient importance to separate A. occidentalis from the genus 

 Arcyria. 



Hab. On dead wood.— Winnipeg, Manitoba (B.M. 3113); Iowa 

 (B.M. 1027) ; New Hants, U.S.A. (B.M. 3114). j 



' Genus 44.— LACHNOBOLUS Fries Fl. Scan., 356 (1835). 

 amended. Sporangia sessile, clustered ; sporangium-wall single, 

 membranous, somewhat persistent, not thickened with angular 

 granules ; capillitium a loose inelastic network of cylindrical 

 threads, with thickenings in the form of closely set warts. 



1. L. congestus Lister. Plasmodium ? Sporangia sub- 

 globose, sessile, clustered and heaped, 0-5 to 0-8 mm. diam., 

 pale copper-colour or ochraceous, shining ; sporangium- 

 wall membranous, firm, papillose, pinkish or ochraceous- 

 yellow. Capillitium a network of freely- branching flaccid 

 pink or ochraceous-yellow threads, irregular, varying from 

 2 to 8 ix diam., closely and equally studded with prominent 

 warts and attached at numerous points to the sporangium- 

 wall. Spores pale pink or yellow, faintly and minutely 

 warted, and with a few scattered stronger warts, 6 to 8 p. 

 diam — Physarum congestum Sonim. Fl. Lapp., 241 (1826). 

 Arcyria circinans Fr. Stirp. Ferns j., 83 (1827) ? A. {Lack- 

 nobolus) congesta Berk. & Br. in Ann. Mag. Nat. Hist., ser. 4, 

 xvii. 140 (1876). A. Hariotii Mass. Mon., 155 (1892). Pert- 

 chacna congesta Fr. Syst. Myc, iii. 192 (1829). Licea congesta 

 Wallr Fl Crypt. Germ., 345 (1833). Lachnobolus circinans 

 Fr. Summ. Veg. Scand., ii. 457 (1849) ? Rost. Mon., p. 282 ; 

 Lister Mycetozoa, 194. L. Sauteri Rost. in Fuckel Symb. 



