hemitrichia] trichiaceae 227 



Switzerland (Zurich Herb.) ; Portugal (B.M. 2989) ; Cameroons, 

 West Africa (B.M. 2990) ; Natal (K. 148) ; Ceylon (K. 1765) ; Java 

 (K. 1768) ; Borneo (B.M. slide) ; Bonin Islands (K. 138) ; Japan 

 (B.M. 2991) ; Montreal (B.M. 2994) ; Philadelphia (B.M. 1486) ; 

 Washington State (B.M. 2992) ; Iowa (B.M. 831) ; California (B.M. 

 slide) ; Colorado (B.M. 2993) ; South Carolina (B.M. 796) ; Cuba 

 (K. 1765a) ; Antigua (B.M. 1683) ; Venezuela (K. 1767) ; Brazil 

 (B.M. 1773); Paraguay (Paris Herb.); Chili (Paris Herb.). 



6. H. leiocarpa Lister. Plasmodium ? Total height 

 1*5 mm. Sporangia scattered, stalked, obovoid, rarely sub- 

 globose, pale grey or ochraceous-grey, 0-7 mm. diam. ; spor- 

 angium- wall evanescent above, persistent below as a cup, 

 membranous, smooth, colourless, longitudinally plicate,, 

 minutely wrinkled transversely. Stalk 07 mm. long, 

 0*05 mm. thick, furrowed, ochraceous-grey, containing spore- 

 like cells. Capillitium a network of frequently branching, 

 pale grey threads, 2 to 5 /x thick, marked with three to five 

 often prominent spiral bands, sometimes smooth, but in many 

 parts studded with numerous spines about 2 //, long ; free ends 

 subclavate, usually spinulose. Spores smooth, pale grey in 

 mass, 6 to 8 /x diam. — Macbr. N. Am. Slime-Moulds, 205. 

 Hemiarcyria leiocarpa Cooke in Ann. Lye. Nat. Hist. N. York, 

 xi. 405 (1877), & Myx. Brit., 88, figs. 252, 255. H. Varneyi 

 Rex in Proc. Acad. Nat. Sci. Phil., 1891, 396. Lachnobolus 

 Eostafinskii Racib. in Rozpr. Mat.-Przyr. Ak. Krak., xii. 80 

 (1884). 



PI. 168. — a. sporangia ;~b. capillitium and spore with fragment of sporangium 

 wall ; (Potts Point, Harpsell, Maine, U.S.A.) 



This species is perhaps hardly more than a variety of the preceding, 

 from which it differs in the pale colour, in the smooth colourless 

 sporangium-wall, the smoother and rather smaller spores, and in the 

 spinose tracts of the capillitium ; the last character is rarely met with 

 in H. clavata. The type of H. Varneyi Rex from Kansas has a more 

 elongated sporangium and a shorter stalk ; but, in comparing the 

 specimen kindly furnished by Dr. Rex with the type of H. leiocarpa 

 from Maine, the other characters appear to be identical. Through 

 the courtesy of Dr. Celakovsky we have been able to examine part 

 of the type of Lachnobolus Rostafinskii Racib. from Cracow ; it appears 

 to agree in all respects with the present species. 



Hob. On dead wood. — Maine (B.M. slide) ; Kansas (B.M. slide). 



7. H. abietina Lister. Plasmodium rose-red. Sporangia 

 crowded or gregarious, shortly stalked or sessile, subglobose 

 or turbinate, 0-3 to 0*7 mm., opaque or shining, yellow, 

 ochraceous, or apricot-coloured ; sporangium-wall mem- 

 branous, yellow, almost smooth, usually evanescent above and 

 forming a persistent cup below. Stalks slender, ochraceous, 

 01 to 0-3 mm. long, filled with spore-like cells. Capillitium 

 a tangle of flaccid, sparingly branched, ochraceous-yellow 



