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 FLAHAULT
4) as
Ostracoblabe implexa of the Saprolegniaceous fungus, and subsequently corrected by BORNETS
5) 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.
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