Key to accepted Heteroconium species 1. Conidia dimorphic, one type of conidia is unicellular and concolorous and second type of conidia is bicellular and bicolorous...... ............................................................................................................................................................................................... H. simile 1. Conidia monomorphic, either concolorous or bicolorous ..................................................................................................................2 2. Conidia concolorous...........................................................................................................................................................................3 2. Conidia bicolorous..............................................................................................................................................................................4 3. Conidia hyaline to pale brown............................................................................................................................................................5 3. Conidia brown to dark brown.............................................................................................................................................................6 4. Conidia guttulated ................................................................................................................................................................. H. avilae 4. Conidia not guttulated ......................................................................................................................................................................17 5. Scar at both ends of conidia............................................................................................................................................. H. triticicola 5. No scars at the end of conidia.............................................................................................................................................................7 6. Conidia both euseptate and distoseptate………………………………………………..…...............................................................8 6. Conidia euseptate………………………………………………………………………....................................................................9 7. Occasionally with a secondary conidium, smooth-walled, 0–6-euseptate, 13–44 × 5.5–10 μm....................................... H. schimae 7. No secondary conidium observed, conidia 3–6-septate, 26–52 × 4–6 μm....................................................................... H. tropicale 8. Conidia aseptate to multi-septate, subclindrical to ellipsoid, verruculose, 10–60 × 7–8 μm....................................... H. kleinziense 8. Conidia 14–22-septate (6–8-euseptate, 8–14-distoseptate), straight or slightly curved, obclavate, 58–93.5 μm × 5–8 μm................ ....................................................................................................................................................................................... H. bannaense 9. Conidia single septate.......................................................................................................................................................................10 9. Conidia with more than one septa ....................................................................................................................................................11 10. Conidia fusiform to cylindrical, pale brown to reddish brown, 23–42.5 × 8.5–10.5 μm.................................................. H. indicum 10. Conidia obclavate to ellipsoid, brown, smooth, 12–24 × 4–6 μm................................................................................. H. ponapense 11. Conidia less than 7-septate ...............................................................................................................................................................12 11. Conidia more than 7-septate.............................................................................................................................................................15 12. Conidia at first smooth and hyaline, later verrucose. ................................................................................................... H. glutinosum 12. Conidia smooth-walled.....................................................................................................................................................................13 13. Conidia in chains of 2, 6–7-septate ............................................................................................................................ H. phellodendri 13. Conidia in chains of 3, less than 4-septate .......................................................................................................................................14 14. Conidia (1–)2-septate, 20–25 9 7–10 μm ......................................................................................................... H. tsoongiodendronis 14. Conidia 1–4-septate, 13.5–32.5 × 5.4–8.5 μm ................................................................................................................. H. lignicola 15. Conidia verrucose with longitudinal striations or with creases, 1–14-septate .............................................................. H. neriifoliae 15. Conidia smooth-walled, 1–10-septate .............................................................................................................................................. 16 16. Conidia not constricted at septa, cylindrical to fusiform, 35–95 × 8–12 μm ............................................................... H. arundicum 16. Conidia slightly constricted at septa, cylindrical to oblong, 10–40 × 3–7 μm.............................................................. H. citharexyli 17. Conidia with a double layered wall ................................................................................................................................. H. asiaticum 17. Conidia with a thick single layered wall ..........................................................................................................................................18 18. Conidia with apical cells pale brown.............................................................................................................................. H. annesleae 18. Apical and basal end of conidia pale brown.....................................................................................................................................19 19. With black band at each septum .......................................................................................................................................................20 19. Without black band at each septum ..................................................................................................................................................21 20. Conidia cylindrical or fusiform, 9–16-euseptate, brown, pale brown ends, 50–85 × 4–6 μm, in chains of 3 ..................................... ........................................................................................................................................................................................ H. neolitseae 20. Conidia, obclavate, thick-walled, 45–110 × 8–12 μm, 8–18-septate, in chains of 2................................................................. H. fici 21. Conidia blastocatenate, in chains up to 3, smooth, rarely verrucose, primary conidia 5–7-sepatate, truncate at both ends, 32–40(– 50) × 8–10 μm, secondary conidia 3–4 septate, rounded above and truncate below, 20–30 × 3–5 μm........................ H. decorosum 21. Conidia blastocatenate, in chains up to 4, smooth, obclavate, 4–7-septate, (mostly 6-septate), slightly constricted at septa, rounded at apex, truncate at base, 31–45 × 7.5–8.7 μm, 4–7-septate............................................................ Heteroconium tulsiense sp. nov.

Published as part of Dubey, Rashmi & Pandey, Amit D., 2022, Heteroconium tulsiense (Antennulariellaceae): a novel microfungus from Sanjay Gandhi National Park, Maharashtra, India, pp. 190-196 in Phytotaxa 536 (2) on page 194, DOI: 10.11646/phytotaxa.536.2.8, http://zenodo.org/record/6257685