1919] KEMPTON—PYCNIDIUM 247 



breaking open of the pycnidium, and its further development into 

 what appears to be an acervulus may be seen. 



Pestalozzia, species indet.; pure culture procured from 

 Dr. G. P. Clinton, New Haven, Connecticut, in November 1916. 

 It had been isolated from dead maple {Acer) bark in October 19 10. 



This Pestalozzia was the most vigorous of all those cultured. 

 Sporing bodies were produced in abundance. Two or 3 contiguous 

 hyphae, or in some cases as many as 10 or 12, take part in the forma- 

 tion of the primordium. A few cells continue to swell and divide 

 until a small mass is formed (fig. no). They branch slightly 

 (fig. in) until a primordium of tissue-like type is formed. It is 

 of compound meristogenous development, especially pronounced 

 in cases where 10 or more hyphae take part. The young pycnidia- 

 like bodies continue to develop, produce spores, then break open 

 (fig. 112) and change into the acervulus form as in the previous 

 species mentioned. 



In Pestalozzia a condition is found that is quite distinct from 

 any other acervulus-forming fungus studied, in that it first pro- 

 duces a sporing body which morphologically is a pycnidium. 

 These pycnidia arise by any of the various modes previously 

 described. The different species vary in the manner of develop- 

 ment, but whatever the method there first appears a pycnidium 

 which later breaks open. and becomes acervulus-like. 



Patellina Speg. 



Patellina fragariae Stevens and Peterson; pure cultures pro- 

 cured of Dr. A. Peterson, September 1916. It was also isolated 

 from strawberries {Fragaria chiloensis Duschesne) from Center- 

 ville, Indiana, June 1916. 



This fungus forms numerous sporodochia in concentric rings in 

 plate cultures. These sporodochia arise in 2 rather typical ways. 

 A few cells of a hypha divide into very short cells. These cells 

 swell and bud, producing numerous branches in some cases (fig. 115), 

 in other cases a tuft of 2 or 3 branches. These branches elongate 

 slightly to form a pedicel (fig. 116), then branch at the tips and 

 radiate to form a distinct urnlike body (fig. 117), within which a 

 cushion or bed forms and gives rise to the conidiophores. The 



