Nickname to Taxonomy Translation Lexicon

Someone posts a photo with the caption “Found some dog vomit slime mold today!” The responses pour in. “That’s Fuligo septica.” “Actually it might be Mucilago crustacea.” “Looks like dog vomit to me.” Everyone is talking past each other. The nickname started the conversation, but it cannot finish it.

This guide translates common slime mold nicknames into the language of actual taxonomy. It helps you move from “looks like” to “consistent with” without skipping the evidence steps.

Why nicknames cause identification problems

Nicknames describe appearance. “Dog vomit” captures the yellow, frothy, somewhat disgusting look of a plasmodial mass. “Wolf’s milk” describes the pink, bead-like fruiting bodies that ooze a paste-like substance when squeezed. “Chocolate tube slime” evokes the brown, cylindrical stalked forms.

These names are memorable. They help beginners notice slime molds at all. The problem is that nicknames map poorly to species boundaries.

Multiple species can match the same nickname. Fuligo septica, Fuligo cinerea, and Mucilago crustacea all look like “dog vomit” at certain stages. Lycogala epidendrum and Lycogala conicum both produce pink “wolf’s milk” beads. The nickname alone cannot tell you which one you have.

Conversely, one species can look completely different at different stages. A fresh Fuligo septica plasmodium is bright yellow and foam-like. The same individual a week later is a brown, crusty aethalium (a cushion-like fruiting structure) that looks nothing like dog vomit.

Key terms

Sporocarp: A single fruiting body that produces and releases spores. This includes stalked forms, cushions, and everything in between.

Peridium: The outer wall of a fruiting body. Its texture, thickness, and opening pattern often identify the genus.

Dehiscence: The way a fruiting body opens to release spores. Regular splitting, irregular breaking, or complete dissolution all point to different groups.

Capillitium: Internal thread-like structures that help disperse spores. The attachment pattern and surface decoration are diagnostic in many groups.

The nickname translation workflow

Step 1: Capture what you actually see

Before you reach for any name, write one sentence describing the specimen in plain, visual terms. No jargon yet. Just what your eyes register.

“Yellow foam-like mass on wood chips, about 10 centimeters across.”

“Pink round beads clustered on dead log, each about 3 millimeters.”

“Dark brown fuzzy tubes standing upright on bark, 5 to 8 millimeters tall.”

This step protects you from the brain’s tendency to lock onto a name and then see only evidence that confirms it.

Step 2: Convert visual words into structure words

Now translate your description into morphological terms.

“Foam-like mass” becomes “aethalium or pseudoaethalium, cushion-like fruiting structure.”

“Round beads” becomes “discrete sporocarps, possibly stalked or sessile.”

“Fuzzy tubes” becomes “stalked sporocarps with spore mass on top, possibly with surface hair or decoration.”

This translation is not about identifying the species yet. It is about describing the structures that actually matter for identification.

Step 3: Build a differential set

A differential set is a list of candidate species that match your evidence so far. Do not pick one winner. List at least two possibilities.

For the yellow foam example, your differential set might include:

• Fuligo septica (common, yellow aethalia on wood mulch)
• Fuligo cinerea (similar but with different spore ornamentation)
• Mucilago crustacea (can look similar, prefers different substrates)

For the pink beads example:

• Lycogala epidendrum (most common, smooth to warty surface)
• Lycogala conicum (pointed projections on surface)
• Lycogala flavofuscum (wrinkled surface, different spore size)

Step 4: Identify the discriminating traits

For each pair of candidates, ask what feature would separate them.

Fuligo septica vs Mucilago crustacea: Look at the peridium (outer wall). Fuligo has a brittle crust that breaks into pieces. Mucilago has a crust that dissolves or breaks down irregularly. The spore ornamentation under microscopy is also different.

Lycogala epidendrum vs Lycogala conicum: Look at the surface texture. L. epidendrum is smooth or has rounded warts. L. conicum has pointed, cone-like projections.

Step 5: State what you see and what is missing

Use this structure for every identification statement:

Observed: What you actually see in your photos or specimen.

Missing: What evidence is not available.

Next needed: What additional information would help.

Common nickname translation table

This table maps frequent nicknames to their taxonomy-safe interpretations.

Nickname	What it describes	Taxonomy-safe interpretation
Dog vomit slime mold	Yellow to orange foam-like mass, often on mulch	Fuligo aethalia. Species determination requires peridium examination and spore microscopy.
Wolf’s milk	Pink to brown round beads that ooze paste when squeezed	Lycogala sporocarps. Surface texture separates species.
Chocolate tube slime	Brown cylindrical stalked forms	Stemonitis or related genera. Capillitium pattern and stalk structure needed for genus confirmation.
Pretzel slime	Net-like or lattice structures	Hemitrichia or Trichia species with reticulate capillitium.
Scrambled egg slime	Bright yellow plasmodium or immature aethalium	Fuligo plasmodium or immature stage of several species. Wait for fruiting to identify.
Flowers of tan	Orange to brown cushion with surface pattern	Tubifera species. Column structure and spore mass behavior are diagnostic.

Minimum evidence before using a scientific name

Before you translate a nickname into a species name, collect this minimum evidence:

1. Habitat context photo showing the substrate and environment.
2. Side-view photo with scale reference visible.
3. Close-up of surface texture and any opening behavior.
4. Note on maturity stage (fresh, mature, degrading).
5. Geographic location and date.

If this set is incomplete, keep your identification at genus level or mark it “pending more evidence.” A correct genus identification with honest uncertainty is better than a wrong species identification with false confidence.

Nicknames are starting points

A nickname is a starting point for investigation, not a conclusion. Treat it as a hypothesis to test, not a fact to confirm.

What to do next

When you encounter a nickname in an identification discussion:

1. Acknowledge the nickname as a useful visual description.
2. State what structural features the nickname describes.
3. List the candidate species that match those features.
4. Identify what evidence would separate the candidates.
5. State what you can see and what is missing.

Related guides

• Community Evidence Grading Standard
• Voucher Metadata Requirements for Expert ID
• Conflict Resolution Protocol for Advanced ID
• Nickname Traps in Slime Mold ID
• Glossary