中国美叶藻属（红藻门,楷模藻科）新种——扇形美叶藻（Callophyllis flabelliforma H.W.Wang sp. nov.）

对采自于辽宁省东港市大鹿岛的美叶藻属海藻的外部形态、内部结构进行了详细观察,并对rbcL基因序列进行了分析.结果表明：（1）藻体直立、膜质、叉状或掌状分枝,边缘全缘偶有微波状,基部生有圆柱状的直立短柄;（2）果胞枝由2～5个细胞组成,无分枝,受精后产孢丝形成卵形囊果,果孢子囊团被不育丝分隔,产孢丝单侧突出;（3）rbcL基因序列分析表明样本LNU20091105、LNU20091106与美叶藻属内其他种间的碱基差异为5.1%～7.6%（27～66bp）,为属内种间差异.在系统树中这2个样本也聚集为美叶藻属内一个单独的进化枝.据此我们认为该海藻是美叶藻属一个新种,命名为扇形美叶藻（Callophyllis flabelliforma H.W.Wang sp.nov.）.

Callophyllis flabelliforma H.W.Wang sp. nov.(Rhodophyta,Kallymeniaceae),a new species from China

Callophyllis flabelliforma H. W. Wang sp. nov. （Halymeniaceae, Rhodophyta） is newly described species of Callophyllis from Liaoning province of China. On the basis of morphological ob- servations and molecular phylogeny, the results as follows. （1） The blades are erect, membranous, di- chotomously or subdichotomous branched in a regular pattern, smooth margins some have laciniate branches. The holdfast is small discoid and extends in a short stipe; （2）The procarp consists of a sin- gle carpogonial branch with 2 -5 cells; oval cystocarps following presumed fertilization are formed from gonimoblast; carposporangium in groups are separated by vegetative filaments; initial gonimo- blasts bulge unilaterally; （3）Through rbcL sequence analysis,the divergence is 5.1%-7.6%（27- 66 bp） between the specimens （LNU20091105, LNU20091106） and other species of Callophyllis, which belongs to interspecific difference of genera. The specimens （LNU20091105, LNU20091106） form a single monophyletic subclade with high bootstrap support （both 100% in NJ and MP analy- ses） in molecular phylogenetic tree. In conclusion, CallophyIlis flabelliforma H. W. Wang sp. nov. is a new species.