Chromoblastomycosis Agents: Sporulation Types
Original bench-card visual comparing how three chromoblastomycosis agents sporulate: Phialophora collarette phialides, Fonsecaea mixed denticulate types, and Cladophialophora long fragile chains.
Chromoblastomycosis agents: collarette, mixed denticulate, and long chains
These agents share sclerotic bodies in tissue but differ in culture sporulation. Phialophora makes collarette phialides, Fonsecaea shows mixed denticulate sporulation, and Cladophialophora forms long fragile conidial chains.
Flask or cup-shaped phialides with a distinct saucer-like collarette. Oval conidia are produced through the apical pore and cluster near the opening.
Mixed sporulation: single-celled conidia arise on short denticles around the conidiophore, with truncated short chains and some collarette types also present.
Long, sparsely branched, fragile chains of elliptical conidia without prominent shield cells. Chains break apart easily during mount preparation.
Flask or cup-shaped phialides with a distinct saucer-like collarette. Oval conidia are produced through the apical pore and cluster near the opening.
Mixed sporulation: single-celled conidia arise on short denticles around the conidiophore, with truncated short chains and some collarette types also present.
Long, sparsely branched, fragile chains of elliptical conidia without prominent shield cells. Chains break apart easily during mount preparation.
Chromoblastomycosis sporulation anchors
| Visual clue | Meaning | Student shorthand |
|---|---|---|
| Collarette phialides | Phialophora type | Saucer-like collarette with conidia at the apical pore |
| Denticulate mixed sporulation | Fonsecaea type | Conidia on short denticles around the conidiophore |
| Long fragile conidial chains | Cladophialophora type | Sparsely branched chains, no prominent shield cells |
| Sclerotic bodies in tissue | Shared tissue form | All three produce muriform sclerotic bodies in tissue |
Chromoblastomycosis agent interpretation guide
| Pattern | What to call it | How to think about it |
|---|---|---|
| Collarette phialides with conidial clusters | Phialophora-compatible morphology | Confirm by validated mold ID workflow |
| Mixed denticulate sporulation | Fonsecaea-compatible morphology | Confirm by validated mold ID workflow |
| Long fragile conidial chains | Cladophialophora-compatible morphology | Confirm by validated mold ID workflow |
- The agents share sclerotic bodies in tissue but differ in culture sporulation.
- Collarette, denticulate, and long-chain patterns separate the three genera.
- Mixed sporulation is a useful clue toward Fonsecaea.
Phialophora collarette, Fonsecaea denticulate mix, Cladophialophora long chains; all = sclerotic bodies in tissue.