8 - ABORTS

Some of the pinheads will begin to grow, then suddenly stop before they become full-grown mushrooms. These are known as aborts (aborted mushrooms). Aborts are just as good for eating as full-grown mushrooms, but they must be picked before they begin to rot. A mushroom that has mold growing on it or which has black goo in the center of the stem is rotten and is not safe to eat. It is often difficult for beginners to identify an aborted mushroom before it begins to decompose. Early warning signs include a halt in growth of the mushroom, and a greenish tinge around the dark colored tip of the primordia that will eventually become the cap of the mushroom. Always completely remove aborts from the cake, even if they are too rotten to eat, because they can get moldy and cause the cake to get infected.

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6 - FRUITING CHAMBER

Many different things can be used for a fruiting chamber, including camping coolers, aquariums, and large plastic containers (Rubbermaid brand or similar containers work great). The fruiting chamber must be at least 6-8" (15-20cm) tall, and have enough floor space for the cakes to be arranged with at least 1" (2.5cm) of free space on all sides. Spread the cakes out as much as possible so that the mushrooms have room to grow. If the chamber is much too tall or too large, it may be difficult to keep the humidity high enough. The bottom of the chamber must be able to contain water, and the lid must be somewhat airtight in order to keep the humidity inside high. Light must be able to shine into the terrarium. If you are using a cooler or non-transparent plastic container, you will need to cut a window into the top of it and seal it with some sort of transparent material so that light can get in but humidity can't get out. For this reason, glass aquariums make very nice fruiting chambers if they are kept at the right temperature range.

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4 - INOCULATION

After the cooker is cold to the touch take the jars out and place them on a clean surface, have an alcohol lamp or a lighter and the spore syringe ready. Shake the spore syringe to break up the spore clumps. To be able to shake it it's necessary that there is a small bubble of air in the syringe. If this is not the case, then you can suck approximately 1cc of sterile air into the syringe by placing the tip of the needle into the flame and slowly pulling the plunger back.


Loosen the foil from all of the jars so it can be lifted easily when you inoculate.

Take the cover from the needle and heat it over the flame until glowing red. Let cool for a few seconds

Take the upper foil layer off and put aside upside down.

Pierce the foil at the edge of the jar with the needle app. 1in(2.5cm) deep and inject the spore suspension towards the inner jar surface. You should see a small drop running down the inner surface of the jar towards the bottom. Each jar is inoculated on 4 equally spaced points. You should use 1 - 1.5 ml of the spore suspension per jar so one 10ml syringe is sufficient for 6 -10 jars.


Put the foil on again. Flame sterilize the needle again after inoculating 3 jars to prevent cross contamination just in case a jar wasn't properly sterilized. When all of the jars are inoculated fold the foil edges up and press them firmly together so you get a nice aluminium foil lid. Write the inoculation date and the species/strain information on the foil with an all surface felt tip pen. If you touch something other with the needle during the inoculation procedure except the foil surface of the bottom foil layer immediately flame sterilize the tip again.

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2 - THE MUSHROOM SUBSTRATE

For one ½ pint jar(~240 ml) you will need:
140 ml vermiculite
40 ml brown rice flour
some vermiculite to fill the jar to the top (app. 20 ml)
water

Put the required amount of vermiculite for all the jars of one batch (for instance 6 jars: 6 x 140 ml = 840 ml ~ 3.5 US cups ) in a bowl. Pour water slowly over the vermiculite while stirring with a spoon .Be careful to only put that much water in as it can be absorbed by the vermiculite. Stir it well so the vermiculite is uniformly soaked with water. When you tilt the bowl you should see just a little water starting coming from the vermiculite. This is when the correct water content is achieved. If there is too much water in the bowl, pour the wet vermiculite in a strainer and let the excess water drain for a minute. Then the vermiculite will be at the field capacity, which is perfect. Now put the required amount of the BRF (for instance 6 x 40 ml = 240 ml = 1 US cup) into the wet vermiculite at once and mix it in with the spoon. The goal is to uniformly coat the wet vermiculite particles with a layer of BRF.

Fill the mixture in jars ½ inch under the top. It's very important to fill the substrate in the jars without tapping it down at all. It should stay very airy and loose to provide optimum conditions for the growth of mycelium. Be careful not to leave any substrate on the upper edge of the jar. If you weren't careful enough and there are some substrate specks at the edge take a clean moist cloth. Otherwise contaminants can start at those spots and work their way down into the jar. Fill up the jar with dry vermiculite to the top. This layer hinders airborne contaminants reaching the underlying substrate in case they manage to come in during the inoculation and incubation. Take a 5in wide stripe of aluminum foil and fold it in the middle. Put the foil over the opening of the jar. If you're using jars with metal lids, you can poke 4 holes at the very edge of each lid with a small nail and hammer and screw the lid on. The holes should be slightly bigger than the diameter of the syringe needle.Fold the foil edges up and press them together so you get a nice aluminum foil lid. Then take a piece of foil measuring 5in x 5in in and put it over the first two layers (respectively the metal lid if you're using lids) leaving the edges of the foil reaching down, since it has to be lifted again during the inoculation. So now you have 3 layers of foil over the opening. The top layer is lifted during the inoculation.

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