Thalogen or Thallogen: How To spell?

The word Thalogen is misspelled against Thallogen, a noun meaning "One of a large class or division of the vegetable kingdom, which includes those flowerless plants, such as fungi, algae, and lichens, that consist of a thallus only, composed of cellular tissue, or of a congeries of cells, or even of separate cells, and never show a distinction into root, stem, and leaf."

Thallogen has double "ll" is mispronounced as "l"
Remember double 'LL' in between the strings tha & ogen which should not be misspelled with single 'L'
Wrong Spelling:  tha-l-ogen 
Correct Spelling:  tha-ll-ogen 
Find more incorrect spellings of Thallogen to spell right way.