The Casper mushroom strain is a specialized,, highly potent, and visually distinct variety of Psilocybe cubensis known for its ghostly white appearance and genetic heritage originating from crossing Albino Penis Envy (APE) with MakShak (Shakti x Melmak). It is considered a, "fun mutant" strain, often favored in microscopy for its unique, stable, and albino characteristics. 
Key Characteristics of the Casper Strain:
Genetics: APE x MakShak.
Appearance: Albino/white, often producing blobs, but capable of growing large, dense, and, "ghostly" fruits.
Microscopy: Because it is an albino mutant, spores are often not ejected easily, requiring the use of swab samples for research.
Potency: Due to its APE and Melmak lineage, it is generally considered to be highly potent, consistent with the reputation of "PE" (Penis Envy) varieties.