| Classification | Potamogetonaceae: Potamogeton | 
| Harvard University Herbaria Barcode(s) | 00053926 | 
| Type Status | Isolectotype | 
| Collector | M. L. Fernald & B. H. Long | 
| Collector number | 27330 | 
| Country | Canada | 
| State | Newfoundland & Labrador | 
| Geography | North America: North America (CA, US, MX) (Region): Canada: Newfoundland & Labrador | 
| Locality | Large pond in barrens south of Flower Cove, Straits of Belle Isle | 
| Date Collected | 1925-09-01 | 
| Habitat | In water over muddy limestone pavement | 
| Container | Flora of Northwestern Newfoundland: Straits of Belle Isle | 
| GUID | http://purl.oclc.org/net/edu.harvard.huh/guid/uuid/0bf982c3-6332-43a0-8f2a-62701cc6afe5 | 
| Harvard University Herbaria Barcode | 00053926 | 
| Herbarium | GH | 
| Family | Potamogetonaceae | 
| Type Status | Isolectotype | 
| Isolectotype of | Potamogeton longiligulatus Fernald | 
| Verified by | Reveal, James Lauritz & Kaplan, Zdenek | 
| Date Determined | 2012 | 
| Determination Remarks | [filed under] | 
| Annotation Text | Isolectotype! | 
| Taxon Reference | (for  Potamogeton longiligulatus Fernald) Mem. Gray Herb. 1932. 3: 66. | 
| Family | Potamogetonaceae | 
| Determination | Potamogeton strictifolius A. Bennett | 
| Determined by | Hanrahan, Danielle | 
| Date Determined | 2015-11-** | 
| Determination Remarks | [current name] | 
| Annotation Text | fide James L. Reveal (BH) & Z. Kaplan (NY) | 
| Family | Potamogetonaceae | 
| Determination | Potamogeton strictifolius A. Bennett | 
| Determined by | Hellquist, Carl Barre | 
| Date Determined | 1983-05-** | 
| Family | Potamogetonaceae | 
| Determination | Potamogeton longiligulatus Fernald | 
| Determined by | Hellquist, Carl Barre | 
| Date Determined | 1983-03-** | 
| Annotation Text | Isotype | 
| Family | Potamogetonaceae | 
| Determination | Potamogeton hillii Morong | 
| Determination Remarks | [label name] | 
| Family | Potamogetonaceae | 
| Determination | Potamogeton longiligulatus Fernald | 
| Annotation Text | Type P. longiligulatus n. sp. [annotated on sheet] | 
| Sex | not determined | 
| Phenology | NotDetermined | 
| Preparation Type | Sheet | 
| Preparation Method | Pressed |