Chromista is a rather unusual Kingdom in that the organisms within it sit somewhere between plants and animals. Some are even more closely related to Fungi than they are to other seaweeds. They are commonly referred to as Brown Seaweeds and play a similar ecological role to other seaweeds.
Although very different in appearance, the microscopic Dinoflagellates and Diatoms also sit in this group. They are connected by the common use of a unique type of Chlorophyll (photosynthetic pigment), called “Chlorophyll-C”. Chromista are also unique in that they do not convert the products of Photosynthesis to starch, like other plants. They store these products in a different part of the cell, too.1
Phylum – Fancy science word for the next level of classification