What are the optimum P. cubensis growth parameters?

taken from

Paul Stamets and J. S. Chilton: The Mushroom Cultivator
If you want more information (and there is plenty!), go buy the book

 Mycelial Types: Rhizomorphic to linear; whitish in overall color but often bruising bluish where injured.
Standard Spawn Medium: Rye grain. See Chapter III.
Fruiting Substrate: Rye grain; wheat straw; leached horse or cow manure and/or horse manure/straw compost balanced to a 71-74% moisture content.
Method of Preparation: See Chapters III, V, and VI. Pasteurization achieved through exposure to live steam for 2 hours at 140