ARCYRIA 253 



7. Arcyria ferruginea Sauter. 



Plate XII., Figs. 6, (, a, 6 b. 



1841. Arcyria ferruginea Saut, Flora, XXIV., p. 316. 



1881. Arcyria macrospora Peck, Rep. N. Y. Mus. XXXIV., p. 43 



1883. Arcyria aurantiaca Raunier, Myx. Dan., p. (44). 



Sporangia ovoid or short cylindric, crowded or gregarious, dull 

 red or brownish, stipitate; stipe about equal to the sporangium, dark' 

 brown or black; hypofhallus well developed, membranous, yellowish 

 brown continuous ; calyculus large, wide and shallow, smooth ; capilli- 

 tium centrally attached, when fresh, brick-red in color, fading on 

 exposure, the threads of uneven size, those above 6-7 ju,, below 3 fx, 

 abundantly branching, marked by conspicuous reticulations formed 

 by the intersection of numerous vertical plates or ridges; spore- 

 mass reddish, spores by transmitted light pale ochraceous, distinctly 

 warted, 10-12 /x. 



This species is distinguishable at sight by the peculiar color and 

 form of the sporangia. Mr. Durand in Bot. Gaz., XIX., pp 89, 

 90, gives a careful study of the form. The same author declares the 

 dehiscence circumscissile. We cannot distinguish A. aurantiaca Raun. 

 from the present form. 



Rare. Maine, New York; Monterey, California. 



8. Arcyria denudata {Linn.) Sheldon. 



Plate II., Figs. 5, 5 a. 



1753. Clathrus denudatus Linn., Sysi. Nat., 1179, 



1794. Arcyria punicea Pers., Rom. N. Mag. Bot., I., p. 90. 



1895. Arcyria denudata (Linn.) Sheld., Minn. Bot. Studies, No. 9, p, 470. 



Sporangia crowded or gregarious, ovoid or short cylindrical, ta- 

 pering upward, red-brown, stipitate; peridium evanescent except the 

 plicate calyculus; stipe about equal to the expanded capillitium, con- 

 colorous, plicate or striate, ascending from a small hypothallus ; capil- 

 litium attached to the whole inner surface of the calyculus and 

 connate with it ; hence not deciduous, bright red or carmine when 

 fresh, turning brown or paler with age, the threads even, about 3 /x 

 adorned with a scries of rather distant cogs or half rings, which 



