was wondering in the photos posted by sct1984,why the trichs seem to be mostly missing the head.
Not every trichome has a head, not all are glandular, and in some cases the heads are simply knocked off, which is common when flowering in high humidity conditions because that causes trichome stalks to be longer/taller and thinner making it easier for the heads to be knocked off.
An Introduction to cannabis Trichomes.
An Introduction to cannabis Trichomes
Non glandular trichomes:
These have two forms. Both these types produce no psychoactive substances, they are:
a. Short and pointed.
b. Long hair like and pointed ie: very sharp. Both are made of calcium carbonate crystal and are clear like glass.
Glandular trichomes:
There are three glandular trichome forms, all have a membrane over a group of resin producing base cells. These are what produce the psychoactive effects from cannabis
1. Bulbous trichomes: Are very very small and only 15 microns across, they help to produce the terpenoids that make up the aromas of cannabis, they may also produce small amounts of psychoactive substance.
2. Capitate sessile trichomes: These are a little larger, at about 30 microns across appear to be attached directly to leaf surface, like tiny clear mushroom heads, these contribute small amounts of psychoactive substance.
3. Capitate stalked trichomes: Are what we associate with trichomes and cannabis, they are the main producer of psychoactive resin, the mushroom like head is produced on top of a stalk. They are what we see making the flower heads and sugar leaves looking frosty. The heads are 50 to over a 100 microns across. The head has an abscission layer between it and the stalk, so it is detachable. Only the heads contain the resin, they are like balloons filled with psychoactive oil globules. As far as I know no one has done any real work to see if the different glandular trichome types contain different psychoactive ingredients. Only the capitate stalked trichomes type are extracted on their own, the capitate heads separate easily from their stalks, these heads are what bubble bags and tumblers collect to make hash.
It is often reported that eating grass can upset your stomach. This can happen if eaten without heating it first. Heating melts the pointed non glandular trichomes otherwise they can irritate the stomach walls while being digested.
Below is a picture showing both stalked capitate trichomes and the very sharp non glandular types.