396 RESEARCHES ON FUNGI 



comparison between the fruit-bodies of S. protracta and C. fusijjes 

 can be made more readily. 



A solitary fruit-body of Sarcoscypha protracta attached by a 

 pseudorhiza to a buried Beech root is shown in Fig. 116 (p. 240) 

 and is strictly comparable with the solitary fruit-body of Collyhia 

 fusipe-s attached to a buried Poplar root show^n in Fig. 194, A 



(p. 388). 



A persistent pseudorhiza which has branched in the second 

 year is shown for Sarcoscypha protracta in Fig. 197, Nos. 3, 4, 5 and 

 6 from the left, and a similar persistent pseudorhiza is shown for 

 Collyhia fusipes in Fig. 194, C (p. 388). 



A pseudorhiza in the third year, i.e. with primary, secondary, 

 and tertiary parts, is shown for Sarcoscypha protracta in Fig. 197, 

 No. 2 from the left, and a similar pseudorhiza is shown for Collyhia 

 fusipes in Fig. 194, E (p. 388). 



The production of a perennial pseudorhiza in Collyhia fusipes 

 and Sarcoscypha protracta, both of which have a mycelium which 

 vegetates in buried roots, affords another example of two very 

 diverse plants having become adapted in the same way to meet 

 the requirements of a similar set of external conditions. 



Probably there are other Agaricaceae beside Collyhia fusipes, 

 and other Discomycetes beside Sarcoscijjyha 2^rotracta, which have 

 a perennial pseudorhiza ; but, if so, they remain to be discovered 

 by further field investigations. 



