ARCYRIA 269 



8. Arcyria ferruginea Sauter 



Flora 24 : 316. 1841. 

 PL XVIII, Figs. 464, 465. 



1875. Arcyria dictyonema Rost., Mon. 279. 



1876. Arcyria intricata Rost., Mon. App. 37. 



1883. Arcyria macrospora Peck, Rept. N. Y. State Mus. 34 : 43. 



1884. Arcyrella inermis Racib., Rozpr. Mat. Przyr. Ak. Krak. 12 : 82. 

 1888. Arcyria aurantiaca Raunk., Bot. Tidssk. 17 : 61, pi. 3, figs. 4, 9-11. 



1893. Arcyria clavata Cel. fil., Myx. B6hm. 29. 



1906. Hemiarcyria expansa Sacc, Syll. Fung. 18 : 212. 



1923. Arcyria ornata Widder, Verh. Zool.-Bot. Ges. Wien 73 : 160. 



Sporangia ovoid or short-cylindric, crowded or gregarious, dull 

 brick-red or brownish to orange, stipitate; stipe about equal to the 

 sporangium, dark brown or black; hypothallus well developed, mem- 

 branous, yellowish brown, continuous; calyculus large, wide and shal- 

 low, smooth; capillitium centrally attached, when fresh brick-red in 

 color, fading on exposure, the threads of uneven size, those above, 

 6-7 ix, below, 3 n, abundantly branching, marked by conspicuous retic- 

 ulations formed by the intersection of numerous vertical plates or 

 ridges; spore-mass reddish; spores by transmitted light pale ochraceous, 

 distinctly warted, 10-12 ix. 



This species is distinguishable at sight by the peculiar color and 

 form of the sporangia. Durand, in Bot. Gaz. 19 : 89-91, gives a careful 

 study of the form. The same author declares the dehiscence circum- 

 scissile. The orange phase is said by Brandza to be abundant in 

 Moldavia. 



Rare. Nova Scotia, Maine, Massachusetts, New York, Washington, 

 California; Europe, South Africa, Ceylon. 



9. Arcyria pomiformis (Leers) Rost. 



Mon. 271. 1875. 

 PI. XVIII, Figs. 468, 469, 470. 



1775. Mucor pomiformis Leers, Fl. Herborn. 218. 



1788. Stemonitis pomiformis (Leers) Roth, Fl. Germ. 548. 



1797. Stemonitis ochroleuca Trentep., in Roth, Cat. Bot. 1 : 221. 



1797. Stemonitis lutea Trentep., in Roth, Cat. Bot. 1 : 221. 



1813. Arcyria silacea Ditm., in Sturm, Deutsch. Fl. Pilze 1 : 15, pi. 8. 



1822. Arcyria lutea (Trentep.) Schw., Schrift. Naturforsch. Ges. Leipzig 1 : 37. 



1829. Arcyria ochroleuca (Trentep.) Fr., Syst. Myc. 3 : 181. 



1885. Arcyria winteri Wettst, (Esterr. Bot. Zeitschr. 35 : 199. 



1894. Arcyria albida Pers. var. pomiformis (Leers) List., Mycetozoa 186. 



Sporangia scattered, gregarious, globose, bright yellow, very minute, 

 0.5 mm. high, 0.3 mm. or less in diameter, stipitate; stipe short, one- 



