PYRENOMYCETES 179 



BoYCE, J. S., "A needle-cast of Douglas fir associated with Adelopus 



gaimi 072711,^^ Phytopathology, 30: 649-659, 1940. 

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Pyrenomycetes 



The Pyrenomycetes include a large assemblage of fungi vari- 

 ously estimated to number between 10,000 and 20,000 species. 

 They possess perithecia the wall of which opens by an ostiolum 

 or pore. The asci are typically arranged in a parallel series over 

 the inner basal wall of the perithecium. This group of Ascomy- 

 cetes is usually regarded as being comprised of four orders, 

 Dothideales, Hypocreales, Sphaeriales, and Laboulbeniales, the 

 last-named of \\'hich is an aberrant assemblage. The orders may 

 be distinguished as follows: 



Perithecial wall differentiated from stroma 



Stromata, if present, and perithecia bright colored, red, yellow, 

 purple, etc. Hypocreales 



