302 THE MYXOMYCETES 



somewhat netted, but the main threads are sinistrorse, as in the 

 threads of a screw. 



Rare. Maine, Pennsylvania, Ontario; Europe. 



13. Hemitrichia clavata (Pers.) Rost. 



Versuch 14. 1873. 

 PL XX, Figs. 536, 537, 538. 



1794. Trichia clavata Pers., Roemer N. Mag. Bot. 1 : 90. 



1875. Hemiarcyria clavata (Pers.) Rost., Mon. 264. 



1892. Arcyria clavata (Pers.) Massee, Mon. 165. 



1893. Hemiarcyria ablata Morgan, Jour. Cin. Soc. Nat. Hist. 16 : 24. 

 1893. Hemiarcyria funalis Morgan, Jour. Cin. Soc. Nat. Hist. 16 : 26. 



Sporangia clavate or pyriform, olivaceous yellow, 1-2 mm. tall; 

 hypothallus thin, dark reddish brown; stipe 0.5-1 mm., yellow above 

 shading into reddish brown below, attenuated downwards, hollow, 

 filled with spore-like cells; peridium shining, breaking open irregularly 

 at the top, up to two-thirds remaining as a goblet-shaped calyculus, 

 rather coarsely papillose or with broken reticulations within; capil- 

 litium bright yellow or somewhat olivaceous, forming a loose network, 

 the threads 4.5-6.5 /x thick, closely wound with four or five spirals, 

 minutely spinulose, appearing rough under an oil immersion lens, 

 apices not numerous, often swollen, obtuse, often tipped with a broad- 

 based api cuius 2-4 ju long; spores pale yellow, globose or subglobose, 

 coarsely papillate, the papillae frequently elongated into ridges which 

 form a more or less complete reticulation, so that the surface is often 

 partly reticulate, partly papillate, 7-9 fx. 



Common and world-wide in its distribution. 



14. Hemitrichia stipitata (Massee) Macbr. 



N. A. Slime-Moulds 207. 1899. 

 PL XX, Figs. 539, 540. 



1889. Hemiarcyria stipitata Massee, Jour. R. Micr. Soc. 354. 



1892. Arcyria stipitata Massee, Mon. 163. 



1893. Hemiarcyria plumosa Morgan, Jour. Cin. Soc. Nat. Hist. 16 : 23. 



Sporangia gregarious, scattered, seldom crowded, globose or tur- 

 binate, olivaceous yellow, stipitate, 1-3 mm. tall; hypothallus thin, 

 dark reddish brown, stipe reddish brown, 0.5-2 mm., rugulose, hollow, 

 filled with spore-like cells, slender, usually uniform in diameter and 

 color from base to apex, often nodding a little at maturity; peridium 

 thin, dull yellow, opening above, one-half or less persistent as a shallow 

 petaloid calyculus which is finely papillate or delicately reticulate 

 within; capillitium yellow, dense, free ends rare, obtuse and not 



