1.孢囊梗菌丝状，短，很少分枝··················指梗疫霉属(Sclcrophthora) 1.孢囊梗分枝明显·······················2 2.孢囊梗上部膨大，分枝呈指掌状··············指梗霉属(Sclerospora) 2.孢囊梗细长，直径均匀····················3 3.孢囊梗单轴，直角分枝，顶端平切状············单轴霉属(Plasmopara) 3.孢囊梗叉状锐角分枝····················4 4.分枝不对称····················拟霜霉属(Pseudoperonospora) 4。分枝两侧对称························5 5.顶端尖细·······················霜霉属(Peronospora) 5.顶端膨大呈掌状，上生小梗，小梗上生孢子囊·······盘梗霉属(Beremia) 三、作业 1.指明绘图的，按要求绘出，并注明所绘各部分的名称。 2.未知霜霉病菌分属鉴定结果。 1．孢囊梗菌丝状，短，很少分枝······················ 指梗疫霉属（Sclcrophthora） 1．孢囊梗分枝明显······················· 2 2．孢囊梗上部膨大，分枝呈指掌状·············· 指梗霉属（Sclerospora） 2．孢囊梗细长，直径均匀···················· 3 3．孢囊梗单轴，直角分枝，顶端平切状············ 单轴霉属（Plasmopara） 3．孢囊梗叉状锐角分枝········· ··········· 4 4．分枝不对称··················· · 拟霜霉属（Pseudoperonospora） 4．分枝两侧对称························ 5 5．顶端尖细······················· 霜霉属（Peronospora） 5．顶端膨大呈掌状，上生小梗，小梗上生孢子囊······· 盘梗霉属（Beremia） 三、作业 1．指明绘图的，按要求绘出，并注明所绘各部分的名称。 2． 未知霜霉病菌分属鉴定结果