Brazil Corumba Spores UK: Microscopy Guide

What Brazil Corumba is called and where the name comes from

The name has two parts, a country and a place. Brazil is the country. Corumbá is a municipality in the state of Mato Grosso do Sul. Wikipedia places it about 425 km north-west of the state capital, Campo Grande. It describes the city as a gateway to the biggest wetlands of the world, the Pantanal. It says the city borders Bolivia and was founded in 1778. Its urban area adjoins the Bolivian cities of Puerto Suárez and Puerto Quijarro. Wikipedia links the city’s importance to the Paraguay River, which opened to foreign trade after the Paraguayan War.

The name Brazil Corumba is a trade name used by sellers. This guide found no public collection record that links a Psilocybe cubensis strain to Corumbá. It does not say the strain came from that city.

Psilocybe cubensis is a single species. Strain names such as this one are informal labels. A 2025 review in the Journal of Fungi describes dozens of strains as informally recognised. It says commercially labelled cultivars often lack genetic similarity across different suppliers. This guide therefore treats the place name as a label.

What to look at under the microscope

Work up through the magnifications in steps. Michael Kuo advises starting at low power and focusing on the spores. Add immersion oil only before the highest power. An oil immersion lens reaches about 1,000 times.

Kuo lists KOH, a 2 percent water solution, as one mounting medium. A 2025 review notes a yellow-brown tint for the species in KOH solution. Use the same medium on every slide. Then the colour you see can be compared from one slide to the next.

On each slide, record the spore shape, length, width, wall thickness and germ pore. Write down these details too.

• The date.
• The objective used.
• The calibration value.
• The mounting medium.
• How many spores you measured.

The range below belongs to the species, not to Brazil Corumba.

Across Singer and Smith (1958) and Batista et al. (2025), published figures run from about 11.5 to 17 by 6 to 11.5 µm.

Measure your own slide. Measure mature spores only. Kuo suggests 10 to 20 measurements, and others recommend more. Report each result as a range, for example 7 to 9.5 by 4 to 5.5 µm.

The 2025 review reports that labelled cultivars often differ between suppliers. A slide measurement therefore describes one syringe, not a name. A label such as Brazil Corumba tells you what a seller calls the syringe. It does not tell you the spore size. Only your own slide, measured with a calibrated scale, can do that.

This guide does not list spore measurements for Brazil Corumba. None were found in the public sources used.

How Brazil Corumba compares with Aztec God

Aztec God is the nearest strain here, for one reason. This shop lists both on its South American strains page. That is a shop grouping, not a scientific one.

This guide does not claim a measured difference between the two. No public source was found that compares their spores. Aztec God has its own guide on this site. Read the Aztec God microscopy guide alongside this one.

Compare the two on one day with one microscope. Match these four things between the slides.

• The objective.
• The calibration.
• The mounting medium.
• The number of spores measured.

Measure 10 to 20 mature spores from each syringe. Compare ranges rather than single spores. Overlapping ranges mean the slides do not separate the two names. Write the strain name, syringe size and date on each slide label. Keep the focus and the lighting the same on both slides. Sketch or photograph one typical spore from each slide, beside the measured range.

Syringe sizes offered

The product page lists two sizes, 10ml and 20ml. The sizes differ in volume. This guide makes no claim about spore counts per millilitre.

The syringes are prepared in the UK. They are sold for microscopy and research only. Open the Brazil Corumba spore syringe page for current prices and stock.

More guides of this kind are in the Learn section.