The pH of the bleached flour is between 3 and 4.5, although the optimal pH of starch gelatinization is between 3.7 and 3.9 . Acidifiers are used in order to reach this pH range.
42.
Basidia typically have 4 spores, attached by a short projection ( a " sterigma " ); after being detached from the basidia the spores migrate towards the center of the peridiole concurrently with the collapse and gelatinization of the underlying tissues.
43.
Smith was later to revise his opinion on the existence of " P . kauffmaniana " as a unique species he believed that environmental variations in humidity were the cause of differences in the cap cuticle gelatinization observed in Pholiotas collected from different North American locales.
