Spore syringe vs spore print vs spore swab: which format for microscopy?
MycoWorld supplies spores three ways. The syringe is the workhorse, the print is the purist's format and the swab solves a real problem for shy species. Here is how each is made and when you would reach for it.
01The spore syringe
Spores suspended in sterile water inside a capped luer-lock syringe. It is the most convenient format for the microscope: one drop, one slide, no rehydration. Because the suspension is made in a hood from a single print, a syringe from an isolated line gives a consistent population every time. It stores in the fridge and is the format most of the library is supplied in.
Its one limitation is colour work. Spores in water show their individual colour under the objective but not the colour of the deposit in mass, which is a taxonomic character in its own right.
02The spore print
A print is the deposit a cap leaves on foil or paper: the raw material every syringe is made from. For taxonomy it is the richer format. You can see the colour in mass (purple-brown, black, rusty, white), the density of the deposit and the pattern of the gills. To examine individual spores you lift a few with a sterile blade into a drop of water on the slide.
Prints keep for years sealed and dry, so they are the archival format. The trade-off is handling: a print is easy to contaminate and harder to dose than a syringe.
The syringe is the workhorse, the print is the purist's format and the swab solves a real problem for shy species.
03The spore swab
A sterile cotton swab rolled across a fresh cap so it picks up the spores directly. It exists because some species and some phenotypes print poorly: low-spore isolates, small caps, species that drop thin deposits. For those the swab is the only reliable way to get a clean sample. On the slide you roll the swab through a drop of water and proceed as normal.
Swabs are the least precise of the three for measuring, and the most practical for hard-to-print lines.
04Which one should you choose
- Starting out or building a reference series: syringe.
- Studying colour in mass or archiving a line: print.
- A low-spore or shy-printing strain: swab.
- Comparing two lines side by side: two syringes from isolated genetics, on adjacent slides, same objective.
Whichever format you pick, the LOT number is what ties it to the library's records, and the strain name should carry its lineage.
Specimens for this story: EMP (Electro magnetic Psilocybe), ACS Ochra, Whitebilly and YV2B [YAK Mutant], all prepared under sterile protocol and LOT-logged in the UK.
Questions people ask
Can I make a syringe from a print myself?
For microscopy the question is usually moot: a syringe from the library is already prepared in a hood from a logged print, and a home-made suspension without a hood will carry contamination that spoils the slide.
Do swabs store as well as syringes?
Sealed and refrigerated they keep well, though a syringe is the more stable of the two over long periods.
Why do some MycoWorld listings say "low spore"?
Some isolates drop very thin deposits. They are supplied as syringes made from carefully collected prints, and the listing says so, because a low-spore line needs a slightly denser drop on the slide.