Never seen this abnormality before. It came from a black triangle x americana. All the other leaves are 5and7 bladed.
That's quite impressive. I thought 11 fingers was a lotI had a 15 blade Friesland Indica leaf a while back.
Ok. Here it is. From a distance it appears like it could have been removed but if ya zoom in you can see it hasn't. This is just the way it grew.Get a photo Rotty I should start a abnormal leaf thread. I have one from a previous grow.