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Quote: This was developed by Lemke (1971). Perlite is a mineral which expands at temperature more than 10000C. The ingredients, of the spawn are : Perlite (1,450 g), wheat-bran (1,650 g), gypsum (200 g), calcium carbonate (50 g), and water (665 cc). The gredients are mixed, filled in bottles and sterlized. Thereafter, the process is the same as for grain spawn. Perlite spawn is easy to disperse and can be produced at a cheaper cost. This spawn can be stored for a long time.
And this one seems to be from Stamet's TMC:
Quote: Perlite Spawn:
120 ml. water 40 g. perlite 50 g. wheat bran 6 g. gypsum 1 g. calcium carbonate