A 1910 idea for Bio Fuel

In the fascinating book, ROUND-ABOUT RAMBLES In Lands of
FACT AND FANCY by FRANK R STOCKTON, NEW EDITION, NEW YORK, CHARLES SCRIBNER'S SONS, 1910, we find an idea for bio-fuel production of which I was not aware.

A VEGETABLE GAS MANUFACTORY.

There is a plant, called by botanists the Fraxinella, which has the peculiar property of giving out, from its leaves and stalks, a gas which is inflammable. Sometimes, on a very still day, when there is no wind to blow it away as fast as it is produced, this gas may be ignited by a match, when the plant is growing in the open air. But this is very seldom the case, for the air must be very quiet, and the plant very productive, for enough gas to be found around it to ignite when a flame is applied.
But it is perfectly possible, as you may see in the engraving, to collect sufficient gas from the Fraxinella to produce combustion whenever desired. If the plant is surrounded by a glass case, the gas, as fast as produced, is confined in the case, and at last there is so much collected in this novel gasometer, that it is only necessary to open the case, and apply a match, to see plant-gas burning.
It is not at all probable that the least use in the world could be made of this gas, but it is certainly a very pretty experiment to collect and ignite it.
There are other plants which have this property of exuding illuminating gas in very small quantities, but none, I believe, except the Fraxinella, will produce enough of it to allow this experiment to be performed.