植物分为藻类植物、菌类植物、地衣、苔藓植物、蕨类植物、裸子植物、被子植物7大类群。除了菌类植物和地衣之外,另5大类群植物中均有杂草。一、藻蕨类杂草的概念我们将属于藻类、苔藓、蕨类植物的杂草统称为藻蕨类杂草,或称孢子植物杂草、隐花植物杂草;将属于裸子植物、被子植物的杂草称为种子植物杂草,或称显花植物杂草。属于被子植物的杂草的数量最多,因此过去人们研究最多的是被子植物杂草,经常提及单子叶杂草、双子叶杂草(被子植物门分为单子叶纲和双子叶纲),而很少阐述属于另几类植物的杂草。介绍藻蕨类杂草的资料颇少,有地资料甚至只字未提。现列举部分资料对藻蕨类杂草的描述。《杂草及其防治》(李孙荣主编,1991)写道:依据亲缘关系可以把杂草分为五大类:藻类植物、苔藓植 Plants are divided into algae plants, fungi, lichens, bryophytes, ferns, gymnosperms, angiosperms seven groups. In addition to fungi and lichen, the other five groups of plants have weeds. First, the concept of algae weeds Fern We belong to algae, mosses, ferns weeds are collectively referred to as algae fern weeds, or spores weeds, cryptococcaceous weeds; will belong to gymnosperms, angiosperms Weeds known as the seed plant weeds, or weed plants. The largest number of weeds belonging to angiosperms, so the most studied in the past are angiosperm weeds, often referred to monocotyledonous weeds, dicotyledonous weeds (angiosperms divided into monocotyledonous and dicotyledonous), and Rarely weed species belonging to other classes of plants are seldom described. Introduction of fern weeds little information, there is no information even without mentioning. Now give some information on the description of algae fern weeds. Weeds and Their Prevention (edited by Li Sunrong, 1991) writes: Weeds can be divided into five major groups according to their kinship: algae, moss