222 • ENDOSPORAE [HEMITRICHIA 



This species lias been found repeatedly, maintaining its distinctive 

 characters, in various States of North America. It is closely allied to 

 Oligonema flavidum, with which it is connected by intermediate forms, 

 and of which it appears to be hardly more than a variety. Morgan's 

 genus Calonema is here retained for convenience of classification. 



Hab. On dead wood. — South Carolina (B.M. 954, 960) ; Ohio 

 (B.M. 2967); Maryland (B.M. 2968); Minnesota (B.M. 2969). 



Genus 41. — HEMITRICHIA Rostafinski Versuch, 14 

 (1873). Sporangia stalked or sessile ; capillitium a more or 

 less elastic network of branching threads, thickened with two 

 to six spiral bands ; spores minutely warted or reticulated. 

 HEMIARCYRIA Host. Mon., p. 261 (1875). 



The original name which Rostafinski gave to this genus is here 

 restored in accordance with the laws of botanical nomenclature, while 

 at the same time it expresses more accurately the affinities of the 

 group. 



KEY TO THE SPECIES OF HEMITRICHIA. 



A. Spores nearly smooth or minutely warted : — 



a. Capillitium red, spinose. 1. H. Vesparium 



b. Capillitium yellow, yellow-brown or yellow-grey — 

 a. Sporangia usually stalked — 



Stalk solid ; sporangia orange ; capillitium spinose, 

 with distinct spiral markings. 2. H. intorta 



Stalk solid; sporangia olive - yellow ; capillitium 

 smooth, spiral markings often faint. 



3. H. leiotricha 

 Stalk solid or absent ; sporangia minute, buff ; 

 capillitium smooth or spinose, spiral markings 

 faint. 4. H. minor 



Stalk hollow, filled with spore-like cells- 

 Cup papillose. 5. H. clavata 

 Cup smooth. 6. H. leiocarpa 

 p. Sporangia sessile — - 



Spirals of capillitium one to three, prominent ; 



sporangium- wall translucent. 7. H. abietina 



Spirals of capillitium three or more, indistinct : 



sporangium-wall thickened with granular deposits. 



S. H. Karstenii 



B. Spores reticulated : — 



Capillitium threads spinose. 9. H. Serpula 



Capillitium threads smooth. 10. H. chrysospora 



1. H. Vesparium Macbr. N. Am. Slime-Moulds, 203 (1899). 

 Plasmodium purple-red. Total height 1-3 to 2-5 mm. Spor- 

 angia clavate or sub-cylindrical, stalked or sessile, combined 

 in clusters or crowded, 1 to 1-3 mm. high, 0-5 to 0-7 mm. 



