1. 1) C. DRECHSLER: Some graminicolous species of Helminthosporium: I (Jour. Agr. Res., 24 641-739, 1923).
2. 2) C. DRECHSLER: Leafspot of maize caused by Ophiobolus heterostrophus, n. sp., the ascigerous stage of a Helminthosporium exhibiting bipolar germination (Jour. Agr. Res., 31, 701-726, 1925).
3. 3) S. ITO and K. KURIBAYASHI: Production of the ascigerous stage in culture of Helminthosporium Oryzae (Ann. Phytopath. Soc. Japan, 2, No. 1, 1-8, 1927).
4. 4) K. KURIBAYASHI: The ascigerous stage of Helminthosporium sativum (Trans. Sapporo Nat. Hist. Soc., 10, 138-145, 1929).