I am connecting with you from Indiana, U.S. Found your forum board while searching to identify a mystery squash which has sprung from my plain old spaghetti squash plant area. It was the first fruit to show and has grown rapidly into the pictured squash. I also have some squash growing from the same batch of seeds that are easily identified as the spaghetti squash variety. Can anyone give me an ideal of what type/variety of squash this might be?
Here is an image of the other squash I have growing out of the same batch of seeds, definitely spaghetti squash :
I retained the seeds in question from last years harvest of spaghetti squash, which when purchased as pre-planted "zucchini" squash. I had 3 zucchini plants from the 4 plant flat thses came from and one was a surprise spaghetti squash plant when things started producing. All of the seeds I planted this season came from those "surprise" spaghetti squash. I'm thinking maybe there was some kind of cross pollination that may have occurred with those spaghetti squash I grew last year. It sure kinda looks like a giant zucchini mutant. It is now about 14 inches long and about 3 1/2 to 4 inches in diameter.
Thanks in advance for your help and any ideals on harvest and preparation! Yup we're definitely going to give this squash a try once we harvest it!

Mark J.