Fig. 1: fronds of C. oishii on the leaf of Valisneria spiralis in nat. state and size.

Fig. 2: small frond, 8/1

Fig. 3: portion of fig. 2, marked ‚a‘, magnified, 220/1.

Fig. 4: lower portion of a young filament, 140/1.

Fig. 5: portion of the lower part of frond in fig. 1, magd., 220/1

Fig. 6: portion of a thicker branch, a little thicker than 400 µm, 390/1.

Fig. 8: portion of fig. 7 showing monospores, 340/1.

Fig. 9: monospores, 340/1.

Fig. 10: vegetative cell, 340/1.

Notes:

1. As Compsopogon oishii is denoted as "sp. n." in the current publication, it must be the 1st desciption of this species. AlgaeBase dates this as of 1915.
2. However, in modern taxonomy (2024-12-03), this species is a synonym of C. caeruleus (Balbis ex C.Agardh) Montagne 1846.
3. Colors may not represent these of the original document.