Table 1.

Microcrystalline purines identified by Raman microscopy in various algal strains

Species	Habitat		Phylogeny	Purine
Symbiodiniaceae	E-S	Alveolata–Dinoflagellata		Guanine
Amphidinium carterae	S	Alveolata–Dinoflagellata		Guanine
Chromera velia	S	Alveolata–Chromerida		Guanine
Microchloropsis gaditana	S	Stramenopiles–Eustigmatophyceae		Guanine
Vacuoliviridecrystalliferum	U	Stramenopiles–Eustigmatophyceae		Guanine
Vischeria sp.	T	Stramenopiles–Eustigmatophyceae		Guanine
Trachydiscus minutus	F	Stramenopiles–Eustigmatophyceae		Guanine
Synura petersenii	F	Stramenopiles–Chrysophyceae		Guanine
Lobosphaera incisa	F, T	Archaeplastida–Chlorophyta–Trebouxiophyceae		Guanine
Desmodesmus quadricauda	F	Archaeplastida–Chlorophyta–Chlorophyceae		Guanine
Chlamydomonas reinhardtii	F	Archaeplastida–Chlorophyta–Chlorophyceae		Guanine
Dunaliella acidophila	Acid	Archaeplastida–Chlorophyta–Chlorophyceae		Guanine
Haematococcus pluvialis	F	Archaeplastida–Chlorophyta–Chlorophyceae		Guanine
Klebsormidium flaccidum	T	Archaeplastida–Streptophyta–Klebsormidiophyceae		Uric acid

The screened species represent diverse habitats: Acid, acidophilic; E, endosymbiotic; F, freshwater; S, marine; T, terrestrial/aerophytic; U, unspecified. The origins of the examined species as well as cultivation approach are described in SI Appendix, sections I.4 and II.3.