Index Nominum Algarum
Bibliographia Phycologica Universalis
The INA is a card file maintained by Paul Silva at the Herbarium of the University of California. It contains nearly 200,000 names of algae (in the broad sense).
The BPU is a card file containing bibliographic references pertaining to algal taxonomy.
Sorry.
Heteronema ovale
(case independent) doesn't appear to be in the indexes to cards or databased entries.
The master index is at:
http://ucjeps.berkeley.edu/ina/img_ndx.html
The main page is:
http://ucjeps.berkeley.edu/INA.html
Indexes (very large files) to all taxa:
_A |
B |
C |
D |
E |
F |
G |
H |
I |
J |
K |
L |
M |
N |
O |
P |
Q |
R |
S |
T |
U |
V |
W |
X |
Y |
Z _