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Citation for Study 1280

About Citation title: "Penicillium cecidicola, a new species on cynipid insect galls on Quercus pacifica in the western United States".
About This study was previously identified under the legacy study ID S1198 (Status: Published).


Seifert K., Hoekstra E., Frisvad J., & Louis-seize G. 2004. Penicillium cecidicola, a new species on cynipid insect galls on Quercus pacifica in the western United States. Studies in Mycology, 50.


  • Seifert K.
  • Hoekstra E.
  • Frisvad J.
  • Louis-seize G.


A synnematous species of Penicillium subgenus Biverticillium was found growing inside emergence tunnels from insect galls (Cynipidae, Hymenoptera, the so-called gall wasps) on scrub oaks (Quercus pacifica Nixon & C.H. Muller) collected in the western United States. The fungus is characterized by the production of synnemata with white or creamish stipes, biverticillate conidiophores with lanceolate phialides typical of subgenus Biverticillium, and small, ellipsoidal, slightly roughened dark green conidia. In culture, the fungus produces velutinous, dark green colonies, with synnemata produced near the margins of the colonies, particularly in fresh isolates exposed to light after 10 days. The fungus produces the extrolite apiculide A and a series of unidentified metabolites also produced by P. panamense. The oak gall species is described here as Penicillium cecidicola and compared with similar described species. An ITS phylogeny suggests that P. cecidicola is a sister species to P. dendriticum, an Australian species with yellow synnemata that also sometimes occurs on insect galls. Notes are included on several other species of Penicillium that we have isolated from insect galls.

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