Black spots on the underside of Jave Fern leaves

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BarryG

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Just received a lovely batch of Java Fern, washed in Hydrogen Peroxide and rinsed thoroughly but noticed these black spots - they're everywhere. Please assure me they're not pests or snail eggs or whatever. Thanks

20230124_165540.jpg
 

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Are you guys sure about that ? Java Fern is the only plant I can grow without trouble. I have some that are ten years old and I’ve never heard or seen this. All mine just sort of appeared as a volunteer on top of an existing leaf. We are talking about Microsorium pteropus aren’t we ? Not something else ?
 

WhistlingBadger

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Are you guys sure about that ? Java Fern is the only plant I can grow without trouble. I have some that are ten years old and I’ve never heard or seen this. All mine just sort of appeared as a volunteer on top of an existing leaf. We are talking about Microsorium pteropus aren’t we ? Not something else ?
Usually they reproduce with baby plants growing on the tips. But they do sometimes create spores like this. (I've never had any successful plants appear from the spores) The black spots that occur from light changes, algae infestations, or high nitrates look a lot different than the spore spots.
 

Byron

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Are you guys sure about that ? Java Fern is the only plant I can grow without trouble. I have some that are ten years old and I’ve never heard or seen this. All mine just sort of appeared as a volunteer on top of an existing leaf. We are talking about Microsorium pteropus aren’t we ? Not something else ?

Yes that is the species. I had this plant in several tanks over the years, and sometimes the spores were very prevalent, other times not at all. I've no idea why, but those small hard spots are spores. Black areas that are patches are signs of nitrogen deficiency, something that is not likely if there are fish being fed to produce am onia/ammonium. Transparent patches means too strong light.
 

FranciscoB

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They are not spores, but packets of spores. They are called sorae. The spores are quite small.
 

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