Leohumicola, a new genus of heat-resistant hyphomycetes
Bibliographic record
Abstract
Abstract The new anamorph genus Leohumicola (hyphomycetes) is described for four species, including three new species isolated after heat treatment of soils collected in Canada. The species produce slow-growing agar colonies that eventually produce lateral or terminal aleurioconidia, with a dark brown terminal cell, and the remains of a paler basal cell that fractures during secession. The genus is compared with Humicola, Trichocladium, Thermomyces, Complexipes and some other morphologically similar genera. Nuclear ribosomal small subunit (SSU) ribosomal DNA sequences demonstrate that Leohumicola is a monophyletic group in the Leotiomycetes, distinct from Humicola and Trichocladium (Sordariales), and Thermomyces (Eurotiales). Internal transcribed spacer sequences (ITS) support our recognition of four species of Leohumicola, each with distinct colony and micromorphological characters. The existence of additional species is probable based on our own ITS sequences and some retrieved from GenBank. The type species L. verrucosa, was recovered from a variety of soil types across Canada, and has sympodially proliferating conidiogenous cells that produce conidia with verrucose terminal cells that measure 4–5.5 × 4–5.5 μm. The SSU of some strains of this species have five long Group I introns that extend the length to more than 3700 nt. Leohumicola lenta produces very slowly growing colonies on agar media and larger conidia than L. verrucosa, and L. terminalis produces only terminal conidia. The latter two species are represented by single strains. The fourth species, L. minima is based on Trichocladium minimum, originally isolated from volcanic ash soil from Chile. Internal transcribed specer (ITS) sequences suggest that Humicola is a synonym of Trichocladium, a finding that may require conservation of Humicola. Dichotomous keys are provided to the accepted species of Leohumicola, and to morphologically similar aleurioconidial genera. Taxonomic novelties: Leohumicola N.L. Nickerson, Hambleton & Seifert gen. nov., Leohumicola verrucosa N.L. Nickerson, Hambleton & Seifert sp. nov., Leohumicola lenta Hambleton, Seifert & N.L. Nickerson sp. nov., Leohumicola minima (de Hoog & Grinbergs) Seifert & Hambleton comb. nov., Leohumicola terminalis Hambleton, Seifert & N.L. Nickerson sp. nov.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".