Translating as "spring rain," harusame are Japanese noodles made from mung bean, soybean, rice or potato flour. They're available in Asian markets and many supermarkets. Harusame are also called cellophane noodles and Japanese vermicelli.
From The Food Lover's Companion, Fourth edition by Sharon Tyler Herbst and Ron Herbst. Copyright © 2007, 2001, 1995, 1990 by Barron's Educational Series, Inc.