Acorn Icon

Create an acorn icon with cross hatching. 

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Start with an oval. Fill it with a light brown.

Select the bottom point with the Direct Selection tool.

With the point selected, select the Pen tool. Hold Option/Alt to change the Pen Tool to the Convert Anchor Point. Click the handle end and move the point up.

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Repeat the process the the other handle to form the tip on the bottom of the acorn. 

Draw a rectangle halfway over the oval. Select both shapes. 

In the Pathfinder Panel, choose the Minus Front mode to remove the upper half.

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Draw a circle a little larger than the acorn base. 

Draw a rectangle halfway over the circle. Select both shapes. In the Pathfinder Panel, choose the Minus Front mode to remove the upper half.

Select the upper half with the Direct Selection tool. The Corner Widget targets appear in the lower corners. Pull them in towards the center slightly. 

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Use the Direct Selection Tool to select the outer edge of the top. 

Copy and paste the shape. Remove the fill and add a stroke. 

Select the Width Shape Tool (Shift + W) and click on the end and pull in toward the line to taper it to a point. 

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Change the stroke to white and move it over the top of the acorn. 

Use Option/Alt to click and drag to duplicate the shape. Once you have done this once, choose COMMAND + D to duplicate the shape repeatedly.

Select the duplicated shapes, then copy, paste, and flip the shapes to create a criss cross patter. 

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If the lines are too wide, select them and change the stroke with to make them heavier or lighter. 

Duplicate the base of the acorn. Duplicate the base again (changed to black here for reference) and make it narrower. In the Pathfinder Panel, choose the Minus Front mode to remove black shape. 

This is how you create a highlight wedge. 

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Make the edge shape white and move it over the base. 

Create a rectangle for the stem. Pull the Corner Widget targets in to round the corners. 

Place the stem on the acron. 

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To create the shading lines, draw a line with the Line Tool, add a dark stroke to it. 

Select the Width Shape Tool (Shift + W) and click on the end and pull in toward the line to taper it to a point. 

Use Option/Alt to click and drag to duplicate the line. Once you have done this once, choose COMMAND + D to duplicate the shape repeatedly. Select all the lines, group them, the choose Edit > Cut.

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Select the base, click on the Draw Inside icon at the bottom of the Tool Bar. Dotted lines appear around the base. 

Paste the cut group of lines into the shape, move them into position and then click on the Draw Normal mode. 

To add the same lines to the top, we have to make the arcs into shapes. Select all the arcs.

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Choose Object >Expand Appearance.

Select the top and all the lines, ​In the Pathfinder Panel, choose the Minus Front mode to remove the upper half.
IMPORTANT: Select all the resulting shapes and choose Object > Compound Path > Make. This make all those bits one shape. 
Select the cap and choose the Draw Inside icon at the bottom of the Tool Bar. Paste the lines into the shape.

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With the pasted lines, if the weight is not correct, used the Direct Selection tool to select a line.

Choose Object > Select > Same > Stroke color and this will select all the lines so you can change the color or weight.

Nice Acorn!