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 ��m....................................... H. schimae 7. No secondary conidium observed, conidia 3���6-septate, 26���52 �� 4���6 ��m....................................................................... H. tropicale 8. Conidia aseptate to multi-septate, subclindrical to ellipsoid, verruculose, 10���60 �� 7���8 ��m....................................... H. kleinziense 8. Conidia 14���22-septate (6���8-euseptate, 8���14-distoseptate), straight or slightly curved, obclavate, 58���93.5 ��m �� 5���8 ��m....................................................................................................................................................................................................... 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 ��m.................................................. H. indicum 10. Conidia obclavate to ellipsoid, brown, smooth, 12���24 �� 4���6 ��m................................................................................. 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 ��m......................................................................................................... H. tsoongiodendronis 14. Conidia 1���4-septate, 13.5���32.5 �� 5.4���8.5 ��m................................................................................................................. 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 ��m............................................................... H. arundicum 16. Conidia slightly constricted at septa, cylindrical to oblong, 10���40 �� 3���7 ��m.............................................................. 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 ��m, in chains of 3............................................................................................................................................................................................................................. H. neolitseae 20. Conidia, obclavate, thick-walled, 45���110 �� 8���12 ��m, 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 ��m, secondary conidia 3���4 septate, rounded above and truncate below, 20���30 �� 3���5 ��m........................ 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 ��m, 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