206 THE NORTH AMERICAN SLIME-MOULDS 



Concerning this species, Dr. Rex says, I.e. : " Externally this 

 species resembles H. clavata Pers., and has probably often been 

 mistaken for it. The capillitium, however, in its structural de- 

 tails and habit of growth, is widely different. The partial 

 untwisting of the loops of the capillitium by drying, after the 

 rupture of the sporangium, causes it to be projected and elon- 

 gated sometimes two or three times the length of the spo- 

 rangium." Outwardly the open sporangium, by the projecting 

 free tips, reminds one of a TricJiia. The capillitium is like that 

 of H. vesfiarium, but less rough, and, of course, different in color. 



Rare. Fairmount Park, Philadelphia; Ohio, Iowa. 



8. HEMITRICHIA CLAVATA (Pers.} Rost. 



PLATE III., i, i b. 



1794. Trichia clavata Pers., Rom. N. Bot. Mag., I., p. 90. 



1873. Hemitrichia clavata Pers., Rost., Versnch, p. 14. 



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



1893. Hemiarcyria ablata Morgan, Jour. Cin. Soc., p. 30. 



1893. Hemiarcyria funalis Morgan, Jour. Cin. Soc., p. 32. 



Sporangia clavate or turbinate, gregarious, scattered or 

 crowded, yellow, olivaceous or brownish, stipitate ; the peridium 

 generally thin, evanescent above, breaking away so as to leave 

 a more or less definite cup beneath ; stipe about one-half the 

 total height, reddish, reddish brown, or blackish, hollow about 

 half-way down ; capillitium various, yellow or ochraceous, made 

 up of slender threads more or less freely branched and netted, 

 bearing four or five regular, even, spiral plates which project 

 sharply and are generally smooth, the free extremities numerous 

 or almost none, swollen, or simply obtuse ; spore-mass concolor- 

 ous, spores by transmitted light pale yellow, globose, minutely 

 but distinctly warted, 89 p. 



This cosmopolitan species is generally one of the first brought 

 in by the collector, its color and comparatively large size, 2-3 mm. 

 high, making it conspicuous. Nevertheless, we are not able to rec- 

 ognize it in the descriptions of the older authors. Rostafinski 

 quotes Schmiedel, Iconcs, 1776, as affording the earliest account 



