JayMan is right, and allow me to clarify and further elaborate on the white bulbs.
First off, the white bulbs are good. It is my understanding that they are part of the sheath at the top of the follicle, and it is completely normal and in fact expected that all hairs shed through the normal human hair growth/shed/rest/growth cycle will have a bulb on them. In short, ALL shed hairs have bulbs on the end. The bulb is NOT the follicle itself! It is is a thin sheath of skin from the outside of the follicle that is supposed to be attached to the hair upon shedding.
Hairs that fall and do NOT have a bulb on them were NOT shed, and were instead somehow severed from their root, perhaps the hair shaft was too dry, or perhaps it was cracked some other way.
Now, some may say that they are certain that a hair was shed, but it has no bulb on it. Wrong. If the hair was shed, it has a bulb, but the bulbs can vary in size depending on the location on the scalp where the hair was shed from, and some shed hairs have bulbs that are so small that it is difficult to see them unless you really examine the shed hair shaft closely.
Bulb size is an indication of the depth of the follicle that the hair was shed from. The bigger the bulb, the better, as bigger bulbs indicate a larger hair follicle, which indicates that the now empty follicle is capable of producing another thick hair. As miniaturization of the follicles occurs, the hairs get more thin, and the bulbs get smaller, as male pattern baldness progresses. Bulbs on a human scalp are not uniform in size. Hairs shed from areas of thicker, more lush coverage will have relatively large bulbs, whereas hairs shed from the high sideburn/temple area will probably have smaller bulbs.