ノリ糸状体の亀の甲病について
1971 年 37 巻 6 号 p. 491-494
詳細
1971 年 37 巻 6 号 p. 491-494
The occurrence of several diseases in Conchocelis cultivation in Japan have been noticed. One of them is “Kamenoko (tortoise-shell-like) disease”, which has hitherto been considered as cracks of shells caused by the luxuriant growth of Conchocelis. The authors studied the morphological aspects of this disease which occurred during the cultivation of Conchocelis in Kyusyu between the period from 1969 to 1970. The results observed are summarized as follows:
Whereas normal shells are inhabited by Conchocelis alone, the shells infected with “Kamenoko disease” were perforated and inhabited also by mycelial thalli. This shellboring mycelium is composed of hyphae, branching mostly at nearly right angles and at moderate intervals, and measuring 1-2 μ in diameter. The main axial hyphae perforate the shell relatively straight from one end to the other. Especially, it is noteworthy as a characteristic structure of this species that the mycelium has small spherical nodules on its hyphae.
The present species agrees well with the mycelial thallus which was identified by BORNET and FLAHAULT4) as Ostracoblabe implexa of the Saprolegniaceous fungus, and subsequently corrected by BORNETS5) to Verrucaria consequens of the lichen. In the cultivation of Conchocelis, the luxuriant growth of this species first injures the growth of Conchocelis and finally kills a part of them.
