B Plus Liquid Culture Syringe 10ML The B Plus strain was developed by a mycologist named Mr. G in the 1990s, with debated genetic origins claiming that B mushrooms are a hybrid of  P. cubensis and P. azurescens. While it is possible to hybridize Psilocybe cubensis, and Psilocybe azurescens, the B liquid cultures sold on this website are 100% Cubensis genetics. B strain mushrooms are sometimes known to grow very large, reaching heights of more than 14″ with caps 6 inches in diameter. They have a golden to orange cap that has a white ring on the edge of the cap. This popular strain is one of the most reliable available for microscopy viewing. Our liquid culture syringes arrive in a high-quality 10cc laboratory grade Luer-Lok style syringe, containing living specimens suspended in sterile nutrient solution. A 1-inch 16-gauge sterile needle is provided with every syringe.