Lutea - Cryptocoryne walkeri var.

Lutea was once thought to be a seperate species but has since been classified as a variant of Cryptocoryne walkeri. It has small blade-like leaves and reddish-brown stems.

Plants from the Cryptocoryne genus are also often known simply as "Crypts". They are some of the oldest plants to the aquarium trade, having been kept since the dawn of the modern aquarium in the 17's. These plants have been known to crossbreed in the wild and hybrids are common as well as a number of variations to individual species.

Crypts can tolerate a wide range of conditions. Most tend to prefer water with a neutral to slightly higher pH and higher hardness but a few prefer slightly acidic water (pH under 7.). A few species can even survive in brackish (slightly salty) water. They can also grow emerged (out of the water) as well as completely submerged; emerged plants may produce a flower while submerged plants multiple using their root system.

Cryptocorynes are notorious for a condition known as "Crypt Rot" in which the leaves fall off and the plant appears to be "melting". This usually happens after the plant is transplanted or experiences another major change in its environment such as the transition between emerged and submerged growth or a swing in temperature or water chemistry. Though the leaves die off, the roots often survive and the plant may regrow over time.

Visit That Fish Blog for more information from our marine biologists and aquatic staff on Crypt Rot, Planted Aquariums and other aquarium-related topics!