Agar comes from multiple sources, as many red seaweeds are “agarophytes” (that is, seaweeds containing agar in their cell walls). Species of Gelidium are the most important source of bacteriological (lab-grade) agar. Other main agarophytes, largely used for culinary agar, include red seaweeds from the genera Gracilaria, Pterocladia, Ahnfeltia, and others. Species from the genera Eucheuma, Gigartina, and Chondrus have been used as agarophytes in research during agar shortages.9
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那么，为何会出现“腊梅”一词？“腊梅”的说法，宋代以后就有了。专家推测，大概率是因为蜡梅在寒冬腊月盛开，就有人写作了“腊梅”。腊月开花的既有蜡梅，也有梅花。因此“腊梅”一词不仅可以用来指代蜡梅，也可以用来指代在腊月开放的梅花。