State-accredited analytical mycology facility under Texas Department of Licensing and Regulation (TDLR LAB #1050). Executing ASTM D7391 non-viable optical spore trap volumetric quantification (raw counts, spores/m³), direct surface bio-tape microscopic examinations, interactive Certificate of Analysis (CoA) report decoding, and turnkey professional mail-in test kit processing directly from our Texas City headquarters with 3-hour emergency STAT capability.
The authoritative standard governing non-viable airborne fungal quantification is ASTM D7391-20. By drawing a precise volume of air through an inertial impaction slit onto an optically clear, adhesive-coated slide, spores are captured in a rectangular trace. Unlike retail culturing, optical microscopy detects both living and dead fungal structures, capturing the true toxigenic and allergenic biological load.
High-velocity air is drawn through Air-O-Cell or Allergenco-D cassettes at an exact 15.0 L/min flow rate for a 5-to-10 minute window (75L–150L total volume), ensuring uniform rectangular impaction without particle bounce.
While budget clearinghouses scan only 10%–20% of the trace and multiply mathematically, Envirogyn analyzes 100% of the transverse trace width at 400x/1000x magnification. This ensures critical marker spores (*Stachybotrys*) are never missed.
Raw spore counts are converted to airborne concentrations using the ASTM D7391 formula: Spores/m³ = (Raw Count / Trace Fraction) × (1000 / Volume L). Results are benchmarked against outdoor controls to classify Condition 1, 2, or 3 ecology.
Calibrated optical impaction trace showing distinct conidia clusters, background particulate matter, and hyphal fragment alignment across the transverse examination axis.
High-power oil immersion resolution distinguishing individual small hyaline conidia (2.0–3.5 µm) of the *Aspergillus/Penicillium* group from non-fungal inorganic debris.
The table below displays real-world analytical results from a 75-liter volumetric spore trap sample (15.0 L/min for 5.0 minutes) evaluated under 100% transverse trace examination (analytical multiplier = 13.33 spores/m³ per raw spore counted).
| SPORE TAXONOMIC IDENTITY | ECOLOGICAL ROLE & TOXIN PROFILE | RAW COUNT | BIOMASS % | CONCENTRATION (spores/m³) | CLEARANCE THRESHOLD INTERPRETATION |
|---|---|---|---|---|---|
|
Stachybotrys chartarum TOXIGENIC BLACK ROT |
Tertiary colonizer requiring prolonged high water activity (Aw > 0.90). Degrades cellulose (drywall paper). Produces macrocyclic trichothecenes (satratoxins G & H). | 1 | 1.1% | 13 spores/m³ |
ZERO TOLERANCE INDOORS. Any detection signals active hidden water damage reservoir (Condition 3). Immediate containment required. |
|
Chaetomium globosum CELLULOLYTIC ASCOMYCETE |
Soft rot indicator of chronic structural timber saturation. Lemon-shaped apiculate ascospores. Produces chaetoglobosins A & C (cytotoxic). | 2 | 2.2% | 27 spores/m³ |
ELEVATED RISK MARKER. Presence confirms persistent roof or pipe leaks. Indicates structural framing degradation. |
|
Aspergillus / Penicillium group SMALL HYALINE CONIDIA |
Xerophilic to hydrophilic micro-conidia (2–5 µm). Rapid aerosolizer. Deep alveolar lung deposition. Allergenic trigger and ochratoxin A producer. | 38 | 41.8% | 507 spores/m³ | RATIO EVALUATION: Outdoor baseline = 160 spores/m³. Indoor/outdoor ratio of 3.17:1 indicates active indoor amplification reservoir. |
|
Cladosporium spp. PHYLLOPLANE FUNGUS |
Most prevalent outdoor mold in Texas Gulf Coast air. Readily colonizes window frame condensation and HVAC evaporator coil drain pans. | 18 | 19.8% | 240 spores/m³ | NORMAL INDOOR ECOLOGY: Outdoor baseline = 1,480 spores/m³. Indoor count represents normal ambient air infiltration. |
|
Curvularia / Bipolaris DEMATIACEOUS PHAEOPHYTES |
Large multi-celled dematiaceous spores (18–35 µm). Outdoor plant pathogen. Can colonize persistently damp subflooring and carpet tack strips. | 4 | 4.4% | 53 spores/m³ | BACKGROUND LEVEL: Outdoor control = 120 spores/m³. Typical outdoor tracking component. |
|
Basidiospores & Ascospores AMBIENT BACKGROUND CONTROL |
Mushrooms, bracket fungi, and outdoor agricultural microflora naturally present in Gulf Coast ambient air currents. | 28 | 30.7% | 373 spores/m³ | Outdoor baseline = 3,200 spores/m³. Lower indoor count confirms HVAC filtration efficiency. |
| TOTAL AIRBORNE FUNGAL LOAD (75 LITERS SAMPLED) | 91 | 100.0% | 1,213 spores/m³ | EVALUATION: CONDITION 3 (ACTIVE AMPLIFICATION) due to confirmed presence of *Stachybotrys* and elevated *Aspergillus/Penicillium* ratio. | |
Air sampling captures aerosolized particulate, but wet, actively growing colonies of heavy-spored fungi (*Stachybotrys*, *Chaetomium*) rarely release spores into the air unless physically disturbed. Direct Microscopic Examination (DME) of adhesive bio-tape lifts provides definitive proof of vegetative colonization versus passive settled dust.
FIGURE 3.1 // BIO-TAPE DIRECT SURFACE EXAMINATION: INTACT CONIDIOPHORES AND BRANCHING VEGETATIVE HYPHAE CONFIRMING ACTIVE STRUCTURAL MAT COLONIZATION.
Many laboratory data sheets are dense, impenetrable grids of acronyms designed to confuse property owners. Our forensic decoder breaks down the 6 critical analytical metrics on an official Envirogyn Certificate of Analysis.
Matches the physical cassette barcode to the electronic digital record (COA-SP-01-LIVING-ROOM). Guarantees specimen provenance in court.
The total liters of air drawn across the impaction slit (75.0 Liters = 15.0 L/min for 5.0 minutes). Accurate volumetric measurement is vital for mathematical derivation.
The concentration represented by a single raw spore (13.33 spores/m³). Calculated as: 1000 / (Volume × Trace Fraction). Lower numbers equal higher analytical sensitivity.
The actual number of fungal structures observed under the microscope during the complete 100% transverse trace pass. Never estimate or guess.
The final normalized density of airborne spores per cubic meter of air (Raw Count × Sensitivity). Enables standardized comparison across rooms and outdoor baselines.
The reference air sample collected outdoors concurrently. An indoor elevation of xerophilic fungi or any presence of toxigenic marker spores confirms an active mold reservoir.
Avoid misleading big-box store gravity settle plates. Our professional test kits include sterile laboratory-grade bio-tape slides, pre-paid return shipping direct to our Texas City bench, and an official state-accredited Certificate of Analysis signed by our Medical Laboratory Scientist under TDLR LAB #1050.
Gravity settle dishes rely on spores randomly drifting onto an agar plate. Because they do not draw a known volume of air (zero liters sampled), they cannot calculate spores per cubic meter (spores/m³). Crucially, small toxigenic spores (*Aspergillus/Penicillium*) remain suspended indefinitely in ambient air and rarely settle, whereas heavy, harmless outdoor plant spores drop rapidly. Gravity settle tests are explicitly rejected by ASTM D7391 and carry zero legal admissibility in Texas real estate closings or insurance claims.
There is no single statutory "magic number" because outdoor background spore counts in Texas fluctuate from 500 to 50,000+ spores/m³ depending on rainfall and wind. Instead, ASTM D7391 and ANSI/IICRC S520 require a differential comparison between indoor samples and concurrent outdoor control samples. Active amplification (Condition 3) is proven when indoor spore levels significantly exceed outdoor levels, when indoor taxa are dominated by water-damage species (*Penicillium*, *Aspergillus*) while outdoor air is dominated by *Cladosporium*, or when toxic marker molds like *Stachybotrys* are detected.
Toxigenic species like *Stachybotrys chartarum* produce large, heavy, sticky spores that are released in low airborne concentrations. If an air sample contains only 1 or 2 *Stachybotrys* spores, a retail laboratory scanning only 10% or 20% of the trace has an 80% to 90% mathematical probability of missing them entirely—falsely certifying the air as clean. Envirogyn's protocol mandates a 100% transverse trace examination under 400x/1000x magnification, completely eliminating sampling blind spots.
Yes. Envirogyn is an accredited Mold Analysis Laboratory licensed under TDLR LAB #1050. Our analytical data packages fully comply with Texas Administrative Code (16 TAC § 78.50) and are formally accepted by independent licensed Mold Assessment Consultants (MAC), property underwriters, title companies, and the Texas Department of Insurance for issuing Certificate of Mold Damage Remediation (TDI Form MDR-1) clearance certificates.
Direct sample drop-off at Texas City headquarters, rapid 3-hour emergency STAT bench service, or turnkey professional mail-in test kit ordering.
