Phytophthora castaneae Katsura & K. Uchida

Weir, Bevan S., Paderes, Elsa P., Anand, Nitish, Uchida, Janice Y., Pennycook, Shaun R., Bellgard, Stanley E. & Beever, Ross E., 2015, A taxonomic revision of Phytophthora Clade 5 including two new species, Phytophthora agathidicida and P. cocois, Phytotaxa 205 (1), pp. 21-38 : 32

Phytophthora castaneae Katsura & K. Uchida , in Katsura, Trans. Mycol. Soc. Japan 17: 241. 1976. IF283626.

≡ Phytophthora katsurae W.H. Ko & H.S. Chang, Mycologia 71: 841. 1979, nom. illegit. [superfluous].

Typification: — JAPAN. Ibaraki: from Castanea crenata Siebold & Zucc. trunk rot, 1971, K. Uchida, holotype specimen Herb. 1971-031 (Plant Pathology Herbarium, Kyoto Prefectural University, Japan) ; ex-holotype culture P8 = NBRC 9753 = ICMP 19434 = WPC P10187 .

Ko & Chang (1979) correctly cited the holotype of the species to be the Japanese specimen “No. 1971-031, Plant Pathology Herbarium, Kyoto Prefectural University, Japan ”, but then described the morphology of an isolate from Taiwan ( ATCC 36818 ) ; this isolate has subsequently been used as a reference strain for P. castaneae (e.g. Q-Bank). However , a culture of 1971-031 isolated by K. Uchida ( P8 ) was deposited in the IFO (now NBRC) culture collection of Japan as NBRC 9753 , and is thus an authentic ex-holotype culture .

Description: — Katsura (1976) provided an initial description of this species and Ko & Chang (1979) described Taiwanese specimens.The more recent description of Erwin & Ribeiro (1996) is still useful, although the circumscription encompasses isolates we consider P.cocois . The primary morphological characters of isolates considered as P.castaneae examined in this work are presented in Table 3.

Habitat: —Known on trunk rot of Castanea crenata from Japan and Korea, on Castanopsis fargesii Franch. from Taiwan, and soil from China.

Other specimens examined:— CHINA. Hainan Island: forest soil, H. Ho , culture FFM 10-5 C = ATCC MYA-3422 = ICMP 19635 = WPC P10661 . TAIWAN. from soil, F. Panabieres culture F441 = ICMP 16915 = SCRP 388 ; Nan Ton County: Lenhuachih ( Lianhuachi ), natural forest soil, 13 May 1988, H. S. Chang , Herb. IMI 325914 , culture L-2 A = ATCC 36818 = ICMP 19450 = CBS 587.85 = IMI 325914 = WPC P15598 ; Nan Ton County: soil under Castanopsis fargesii , 13 Nov 2010, S. E. Bellgard, culture REB326-308 = ICMP 18737 . JAPAN. Ibaraki: from Castanea crenata trunk rot, 1971, K. Uchida, culture P1 = NBRC 30433 = ICMP 19435 ; Ibaraki: from C. crenata trunk rot, 1971, K. Uchida, culture P3 = NBRC 30434 = ICMP 19436 ; Ibaraki: from C. crenata shoot, 1971, K. Uchida, culture P12 = NBRC 30435 = ICMP 19437 .

Other Remarks:— Pennycook (2013) reviewed the nomenclatural status of P. katsurae and found this name to be an illegitimate, superfluous replacement of the legitimate original name, P. castaneae .